What "archival" means: conservation framing decided piece by piece
No United States body defines archival, conservation or museum framing. This chapter reads the label against what is actually defined, puts the one live graded specification beside the shop vocabulary, and picks a level for each piece rather than for the whole pile.
Start here Essentials
At minimum this chapter asks you to pick a level for one piece and write five material decisions under it. Everything marked Go deeper is optional on a first pass.
- Read the four levels and pick one per piece from the worth answer. Not one for the whole pile (The four levels).
- For any photograph, ask whether the enclosure has passed the Photographic Activity Test. Name the standard by its current edition (The one test that is a standard).
- Write the five decisions for one piece into the framing plan. Board, attachment, glazing, backboard, sealed or not (The five decisions).
- Check your plan for the words "acid free". Nothing in it should rest on them alone (The words).
Minimum time: about 25 minutes for one piece. Done when: every piece in the framing plan carries a level and five named material decisions, and the photographs' enclosures are specified by test rather than by adjective.
1. The words, and which of them are defined Understand
Here is the position, as plainly as this manual can put it. In the United States there is no standards body behind the words conservation framing, preservation framing or museum framing. The body that once wrote framing standards and test methods there, whose method names still appear on supplier specification sheets, has no live site or current publication, and the only account of what became of it that this research could find is an unverified post on a trade forum, which is not citable. The US trade association that certifies framers publishes no exam content outline, and its study guide was listed as unavailable when this research was done.
So the adjective on the label is doing no work. Four things are defined, and they are what to ask about instead.
| What is defined | By whom | What it actually says |
|---|---|---|
| The Photographic Activity Test | An international standard, ISO 18916, current at its 2025 edition | Whether an enclosure material will chemically attack a photograph, measured with two detectors |
| Album, framing and storage materials | An international standard, ISO 18902, current at its 2013 edition, reviewed and confirmed in 2023 | The physical and chemical requirements for materials used with processed imaging materials, explicitly including framing and glazing materials |
| Board grades | A UK trade body's mountboard standard | Fiber content, pH, alkaline reserve, metal content, sulphur content and testing methods, level by level |
| Four levels of framing | The same UK trade body, 2021 | Board, attachment, glazing, backboard, hanging and finish specified at each of four levels, each with a stated protective life |
And here is the single cleanest statement any body makes about the vocabulary readers are sold, from that trade body's own mountboard standard: the use of the term "acid free" must be avoided in product specifications. Ask the authority
The international standard says something similar about the word this chapter is named after. Its withdrawn 2007 edition put it in one sentence: passing the Photographic Activity Test does not indicate that a material is archival, a term that has no clear definition and is not used in this standard. The current 2025 edition keeps the substance: passing the test alone does not indicate that a material is archival, and quality requirements for photo-safe storage enclosures are covered in the other standard, which includes passing the test's criteria.
That is the whole of it. The word is not a specification. The materials and the methods are.
2. The one test that is a standard
The Photographic Activity Test is the only test in this subject that a household can meaningfully ask about, because materials either passed it or did not.
The laboratory that developed it explains what it does: it explores the possibility of chemical interactions between photographs and a given material after prolonged contact, using two detectors. One screens for oxidation and reduction reactions that can cause image fade, silver mirroring and red or gold spots. The other screens for chromophores, compounds that can cause yellowing of the support. A federal leaflet gives the same two components in plainer words and adds the conclusion: the only way to be certain of photographic inertness is to have materials undergo the test.
What is in scope: the standard says it applies to all general photographic enclosure materials used for storage, display and transport, such as paper, tissue, cardboard, mat board and plastics, and also to components of those materials including adhesives and marking substances such as inks, paints, labels and tape. The developing laboratory lists the image types it evaluates against: silver gelatin, chromogenic, inkjet in both dye and pigment, dye-diffusion transfer, electrophotography and diazo.
What is not in scope, from the standard itself: harmful physical interactions, blocking, dye bleed, adhesive migration, plasticizer exudation, and the enclosure's own chemical stability, physical integrity or workmanship. And one commercial fact worth knowing, from the withdrawn edition's own text: if a brand of enclosure material is found safe, there is no assurance subsequent batches will contain the same ingredients, which is why materials are tested annually or on each formulation or supplier change, and why each color of a product is evaluated separately.
A scope change happened in 2025 that affects households specifically. The 2007 edition explicitly covered inkjet prints made with dye-based and pigment-based inks among the materials evaluated. The 2025 edition's main method covers silver-gelatin and dye-gelatin prints, and moves chromogenic and diazo into an annex. So the standard most likely to matter for a modern home print no longer names it in its main scope, and the route to covering home prints is the other standard, ISO 18902, whose image types in scope include dye- and pigment-based inkjet, dye diffusion thermal transfer and electrophotographic digital prints. Ask the authority
The question to ask in a shop: has this board passed the Photographic Activity Test? For a photograph that is a better question than anything about pH, because it does not depend on whose buffering convention your framer follows. A national library puts it as the definition of the term: to be considered photo-safe, storage materials must pass the physical and chemical requirements outlined in ISO 18902, including passing the Photographic Activity Test.
3. The four levels
The UK Fine Art Trade Guild publishes a document called Four Levels of Framing, dated 2021. It is a UK trade body's specification, not a standard and not a US one, and this manual uses it because it is the only live graded framing specification this research found anywhere: the only place where a framing decision is written as a specification with a stated protective life attached.
Each level is specified under the same headings: objective, what it suits, frame and moulding, the mount package, windowmount, attaching artwork, glazing, backboard, hanging and finish. The protective lives quoted below are the Guild's own, under conditions the Guild defines, which its companion mountboard standard states as out of direct sunlight, between 10 and 25 degrees Celsius, and between 40 and 60 percent relative humidity.
| Level | The Guild's objective | Protective life, in its words | Board | Attachment |
|---|---|---|---|---|
| Level 1 Ultimate | Ultimate protection using conservation methods and the best quality conservation materials | "should last for in excess of 35 years" | 100 percent cotton, minimum 1100 microns | Lignin-free pH-neutral paper hinges with starch or cellulose-ether adhesive, 5 to 8 mm overlap; self-adhesive tapes in any form not acceptable |
| Level 2 High | High level protection using conservation methods and conservation materials | "in excess of 20 years" | At least 84 percent alpha cellulose, minimum 1100 microns; unbuffered cotton board still required for traditionally processed photographs | As Level 1, with double-sided tape permitted for joining double window mounts if kept at least 12 mm from the bevel |
| Level 3 Mid | Mid level protection using good quality materials and methods | "should last for around 5 years in 'normal conditions'" | Mid grade; processes preferably reversible | Preferably reversible |
| Level 4 Low | Low level protection using basic materials and/or methods; a visually acceptable frame at a budget price | "No pretence is made to protect the artwork or its long-term visual appearance" | Cream core or better | Artwork may be slotted in unfixed or stuck down; mitres may or may not be glued |
Three details from the document that are worth having in your head at a counter. At Level 1, pastels and chalk drawings should be spaced at least 5 to 6 mm from the glazing, with no fixative on migrant or delicate pigments; the backboard should be at least 1500 microns with a barrier layer; the frame back is secured with points or tacks and flexible tabs are not acceptable; and there should be pads at least 3 mm thick at the two lower back corners, plus a label with the date. Level 3 suits replaceable artwork of limited commercial value where visual appearance is important. And the Guild's own advice to its certified framers is that they should view the mid level as a minimum standard and work to the high level where possible.
The US shop vocabulary, beside it. American shops generally offer something like "conservation" and "museum" tiers. Those words map loosely onto board grades, as a practitioner supplement explains: boards of purified wood pulp are often sold as conservation boards, and boards of cotton as museum or rag boards. They are not graded specifications with stated lifetimes, and nothing requires one shop's "conservation" to mean what another's does. One further wrinkle the Guild's own mountboard standard records: internationally, Belgium reverses the words "conservation" and "museum".
So the practical move at a US counter is not to ask for a level by name. It is to ask the five questions below, which is what the levels are made of anyway.
A level is a specification for materials and methods, not a promise about a piece. The stated lifetimes are the Guild's, under conditions the Guild defines, and this manual quotes them as that rather than as a prediction about your hallway. No level substitutes for a dark wall, and no label on a board substitutes for the test it claims. If a shop tells you a package is good for 35 years, what that can honestly mean is that it meets a specification whose publisher attaches that figure to it in stated conditions.
4. Deciding per piece: the five decisions
Strip the levels down and five decisions change where a package sits. Everything else follows from them.
| Decision | Cheap version | Expensive version | What the worth answer does to it |
|---|---|---|---|
| Board grade | Mid grade | 100 percent cotton, unbuffered where the piece needs it | Drives it hardest. This is the one to spend on, because what it does wrong it does to the art |
| Attachment | Dry mounted, or slotted in | Paper hinges with starch paste, or non-adhesive corners | Drives it hard, and it is the least reversible. Only a replaceable piece can take the cheap version |
| Glazing | Ordinary glass | Ultraviolet-filtering, anti-static or anti-reflective | Drives it less than people think. What the ultraviolet claim covers shows what it buys on each material |
| Backboard | Whatever the frame came with | At least 1500 microns with a barrier layer | Cheap to get right and usually ignored |
| Sealed or not | Not sealed | A sealed package inserted into the frame | The one with the least published evidence behind it; see the sealing question |
Pick per piece, from the replaceability answer you wrote in What you have. A collection of twenty does not want one level; it wants two or three, and buying board in two or three grades is how a household ends up specifying honestly rather than over-specifying in some places and under-specifying where it counts.
Worth saying plainly: a mid-level package on a reprintable print is the right answer, not a compromise. The Guild's own text puts Level 3 as suitable for replaceable artwork of limited commercial value where visual appearance is important, which is an accurate description of most of what hangs in most houses. Spending Level 1 money on a poster is not more careful; it is just more expensive.
And the habit, taught in one paragraph: check the edition before quoting a standard. Standards move, and conservation literature lags. If you are going to name a number to a supplier, look it up on the standards body's own catalogue page first and check its status. That takes two minutes and it is the difference between asking for a current requirement and asking for a withdrawn one.
5. What a level does not buy
Two published statements set the ceiling on this whole chapter.
First: light damage is cumulative and irreversible. A conservation institute's agent-of-deterioration page, the preservation leaflets and the national library's guidance all rest on it, and a preservation leaflet puts the consequence in one line: no paper, wood, leather, textile or other organic object should be on permanent display.
Second: the safest thing a household can do with a valuable original is not to frame it better. A national library's framing guidance says long-term or permanent display of paper-based materials is not recommended and that the preferred alternative is to store the original well and frame a well-made reproduction. The national archives says the same to households, and a conservation institute's note on storing works on paper comes at it from the storage side.
So the honest order of operations is: choose the wall first, then the level. A Level 1 package on a sunny wall will outlast the image in it. Where it can hang is the chapter that puts numbers on that, and the exposure box is where you see what your own wall costs per year.
One more thing a level does not buy: treatment. The Guild's own document is explicit that any restoration or conservation treatment should be carried out by a professional conservator before framing. A damaged piece does not get better inside a good package; it gets preserved in the condition it is in.
Go deeper 6. Withdrawn editions still in circulation
This is the finding that most surprised this research, and it is a practical risk rather than a curiosity: three current, widely cited conservation pages quote standards numbers that have been withdrawn, so a reader following one of them literally would quote an obsolete requirement to a supplier.
| What a current page says | What is actually current |
|---|---|
| A preservation center's leaflet on storage enclosures instructs readers that enclosures should meet both ISO 18902:2001 and ISO 14523:1999 | Both withdrawn. ISO 18902:2013 is current and was reviewed and confirmed in 2023; ISO 14523:1999 was replaced by ISO 18916:2007, which is itself withdrawn and replaced by ISO 18916:2025 |
| A national library's photographs page cites ISO 18916:2007 | Withdrawn; ISO 18916:2025 is current |
| A 1993 federal leaflet instructs readers to ask suppliers whether products comply with an American national standard from 1991 | Superseded by the ISO 18902 series. The leaflet is still listed on the agency's current index with no replacement, so its chemistry is sound and its citation is history |
| A UK trade body's mountboard standard refers in its introduction to the five levels of framing | The same body's 2021 Four Levels document replaced the five-name scheme. Cite the 2021 document for the levels, and the mountboard standard for board specification only |
| A UK trade body's mountboard standard requires board to pass the test under its 1999 number | Same chain: the test is ISO 18916, 2025 edition |
None of this means those pages are wrong about chemistry. It means that the number is the part that goes stale, and that the pages are maintained less often than the standards are revised. When you quote a number, quote the current one and say so.
The two credentials, named and not recommended. The UK trade body's Guild Certified Framer qualification is a practical bench examination of about two hours plus a written paper drawn from a question bank, with three pieces prepared in advance to stated specifications; an advanced version adds three specialist modules in textile framing, mount design and conservation framing. The US association's Certified Picture Framer is a three-and-a-half hour written examination, open to framers with at least a year of hands-on retail or wholesale experience, offered in imperial or metric; its master level requires five years as a professional framer, a passed written exam, and the submission of four framed pieces, a canvas, a print, a textile and an object, which examiners take apart and score, plus timed work on site. Both recertify on a cycle. This manual names them because a reader may see the letters after a framer's name and wonder what they mean; it does not recommend choosing a framer on them, and A framer or yourself gives the questions that tell you more than a credential does.
7. See it See it
One household, three levels. The Okonkwos (fictional) have fourteen photographs and sort them in ten minutes. Eleven are modern lab prints, reprintable from files they still have: mid level, standard conservation board, ultraviolet-filtering glazing because the wall is sunny, corners, a decent backing board, not sealed. Three have no negative and no file: the board goes to unbuffered cotton, the attachment to corners on unbuffered alpha-cellulose paper, the glazing to anti-static acrylic because of the children, the backing to a barrier-layer board, and the sealing question gets a yes. Known: which prints are which, and that the three are traditionally processed. Assumed: that the shop's board has passed the Photographic Activity Test, which they ask about and the shop confirms from its own supplier sheet. Open: whether the three should be on that wall at all, which Where it can hang settles and which, in the end, moves two of them. The sorting cost them nothing and changed the quote on three frames out of fourteen.
- Four levels of framing, 2021, a UK trade body: seven pages, four levels, each specified under the same headings with a stated protective life. The single most useful document in this subject, and a trade body's rather than a standard.
- The Photographic Activity Test, the laboratory that developed it: what the two detectors look for, which image types are evaluated, and what the test does not promise.
- ISO 18916:2025, the standards body's own catalogue record: the current edition, its scope, and its statement that passing the test does not make a material archival.
- Quality standards for mountboard, the same trade body: what each board grade must contain, in measurable terms, and the sentence about "acid free".
8. Practice Practice
Minimum: one piece with a level and five decisions written down. Time: about 40 minutes. Materials: your picture list, the levels table above, and the framing plan.
- Sort your pieces into groups by replaceability. Not by size or by room. Most households end up with two or three groups and are surprised how small the top one is.
- Assign a level to each group. Write it in the framing plan, with the reason beside it in four words.
- Fill in the five decisions for one piece in the top group. Board, attachment, glazing, backboard, sealed or not. Use the words from the levels table rather than adjectives.
- Audit your own plan for adjectives. Read it back and circle every "archival", "acid free", "museum quality" and "conservation grade". Replace each with what it is made of, or with the question you will ask.
- Check one edition (Go deeper; optional). Look up ISO 18916 or ISO 18902 on the standards body's own catalogue page and read the status line. Two minutes, and it is the habit this chapter most wants you to keep.
9. Your pictures Your pictures
10. Check your work Check your work
Criteria
- Every piece carries a level, and different pieces carry different levels.
- The five decisions are written in materials and methods, not adjectives.
- Photographs are specified by the test, not by pH alone.
- Any standard you name is named by its current edition.
- The plan does not claim a lifetime; where it quotes one, it says whose and under what conditions.
Worked example
Hal Brewer (fictional) writes one line for his grandmother's watercolor: Level 1 equivalent. Board: 100 percent cotton, four-ply window over four-ply back, buffered (not a photograph). Attachment: two T-hinges of Japanese tissue with cooked wheat starch paste, plus a loose bottom hinge. Glazing: ultraviolet-filtering glass, 2.5 mm. Backboard: barrier-layer board behind the rag back mat. Sealed: yes, sealed package into the frame. Conservator first, for the tape. Label on the back with today's date. Eight lines, no adjectives, and a framer can quote against it exactly.
Common mistakes
- Asking for "archival framing". It commits nobody to anything. The standard that defines the test says the word has no clear definition and does not use it.
- Choosing one level for everything. It over-specifies most of a collection and under-specifies the few pieces that matter.
- Treating the Guild's lifetimes as predictions. They are the Guild's figures, under the Guild's stated conditions, for a specification, not for your wall.
- Quoting a standard number from a conservation page without checking it. Three current pages in this research cite withdrawn editions.
- Buying the level instead of the wall. A Level 1 package on a sunny wall is money spent in the wrong place.
What is still unresolved
- Who does the work, and what it costs: A framer or yourself.
- Whether the wall you have in mind can take the piece at all: Where it can hang.
- What the pieces are worth, which is an appraiser's question and not this manual's.
- Whether a piece needs treatment before any framing: a conservator, and the Guild says so too.