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CHEMICALS USED IN COLLOTYPE
- Chromium alum : General use to tan the gelatin – increase of the resistance,…
- Ammoniaque : Used to clean glass patches before spreading the adhesive sublayer…
- Ammonium dichromate : Returns the photosensitive gelatin (at U.V. once dry)…
- Potassium dichromate : Returns the photosensitive gelatin (at U.V. once dry)
- Washing soda : Used to clean glass plate before re-use ( non-hazardous use)…
- Natural sponges : Allows to get back diverse liquids put down on the plate without damaging it…
- Formalin : Glycerin additive…
- Sodium silicate : Called collectively “chemical glue”, it is used for the preparation of the sublayer…
- Acid fluorhydrique : (Just for the record because although very effective, this acid is dangerous) was used to clean glass plates before re-use.
- Fish glue : (Just for the record) formerly used to harden gelatins. The fish glue is a gelatin made with the pocket of flotation of sturgeons.