Material
Photograph
A gelatin image layer on a paper or plastic base. Wet, the emulsion is soft and sticks to anything, and touching it takes the picture off.
- SurfaceSemi porous
- WashingNo water
- Colour run riskHigh
- Reviewed7 September 2026
What photograph can and cannot take
- Heat Avoid
- Water and soaking Avoid
- Acids, including vinegar Avoid
- Strong alkalis Avoid
- Solvents Avoid
- Chlorine bleach Avoid
- Abrasives Avoid
Always test on a hidden area first and let it dry before you treat the visible mark.
General rules for photograph
The image is a soft gelatin layer when wet, and touching it removes the picture. That is the single fact to hold onto.
Separate photographs from albums, sleeves and each other before they dry, because a wet emulsion sticks to whatever it touches and cannot be parted afterwards without loss.
Lay them face up on absorbent paper with air moving in the room. If there are too many to deal with at once, freeze them interleaved with waxed paper and work through them later.
Check the label
Conservators are unambiguous: do not touch the emulsion of a wet photograph and do not let it come into contact with anything else as it dries. Photographs are spread out face up on absorbent material with air circulating, and frozen with interleaving if they cannot be dried at once.
Stains on photograph
- Baby sick Do not touch the front of a wet photograph. Conservators are explicit that the emulsion must not be touched o...
- Blood Blot fresh blood with a dry white cloth and stop before adding water or cleaner. Photograph can be permanentl...
- Body oil Keep the image surface untouched. Do not blot, rub or apply liquid or powder to the printed layer. Ask a phot...
- Breast milk Place absorbent material beside free liquid without rubbing the image. Do not separate photographs that are s...
- Bronzer Lift loose bronzer from photograph before it is rubbed in. Blot cream bronzer, follow the material or care la...
- Coffee Remove only free surface coffee from photograph without rubbing or adding liquid. A dried or absorbed mark ne...
- Concealer Lift loose concealer from Photograph while dry and absorb fresh oil without rubbing. Do not add water or make...
- Cooking grease Lift and absorb cooking grease from Photograph without adding liquid. Water or solvent can enlarge the damage...
- Hair dye Blot Photograph dry without rubbing or adding household cleaner. Keep the dye box and ask the appropriate lea...
- Lipstick Lift lipstick from Photograph while dry and absorb fresh oil without rubbing. Do not add water or make-up rem...
- Motor oil Blot and absorb motor oil from Photograph without adding liquid. Water, solvent or pressure can enlarge the d...
- Nail polish Keep the affected face untouched. Do not blot, scrape, rub or test water or solvent on an image or unidentifi...
- Period blood Blot fresh period blood with a dry white cloth and stop before adding water or cleaner. Photograph can be per...
- Pet urine Blot fresh urine with plain white towel and stop before adding water or cleaner. Photograph can be permanentl...
- Sweat Blot sweat from Photograph without adding liquid. Let it dry, remove only loose salt gently and refer a visib...
- Tomato sauce Lift dry and wet tomato residue from Photograph without rubbing or adding liquid. Blot gently, then refer any...
A photographic print is an image held in a gelatin emulsion on a support.
The emulsion softens when wet
Gelatin absorbs water and swells. In that state it is easily scratched, easily lifted and it will bond to any surface it dries against, including another photograph, an album page or a plastic sleeve.
Conservators say do not touch it
Not as a caution but as an instruction. There is no gentle way to wipe a wet photograph, because wiping removes image.
Freezing works, with exceptions
Interleaved freezing is the standard way to buy time. Glass plate negatives, ambrotypes and tintypes must never be freeze dried, and old photographs and negatives are best kept out of a domestic freezer entirely.
Copying is a real answer
A photograph that has been damaged can still be scanned or photographed and the copy repaired digitally, which is frequently the sensible outcome.
Similar materials
Sources
What we checked and when. Where a manufacturer instruction disagrees with anything here, follow the manufacturer.
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Emergency salvage of wet photographs, Northeast Document Conservation Center
authority
Conservation centre guidance that the emulsion of a wet photograph must not be touched or allowed to contact anything as it dries, that photographs are separated from enclosures and each other and spread out face up on absorbent material with air circulating, that freezing interleaved with polyester or waxed paper is the alternative when they cannot be dried at once, and that glass plate negatives and tintypes must never be freeze dried.
Checked 7 September 2026
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Emergency salvage of flood damaged family papers, US National Archives
authority
National archive guidance that paper is very fragile when wet and must be handled carefully, that wet material is air dried on absorbent blotting material with fans circulating air but not blowing directly onto it, that books are stood open on edge with interleaving replaced as it absorbs moisture, that material which cannot be dried within two days should be frozen to stop mould, and that photographic print surfaces must not be touched.
Checked 7 September 2026
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Water damaged photo restoration, EverPresent
specialist
Photo restoration specialist advising that photographs which have stuck together and partly dried should not be pulled apart because the result can be disastrous, that prints are dried on absorbent material away from wind, pets and direct sunlight with the material replaced as it loads up, that blotting the surface risks harming the emulsion, that freezing stops the damage worsening and prevents mould, and that a digital copy is the reliable way to preserve the image.
Checked 7 September 2026