Realization of the photosensitive layer serving as printing matrix.
Degreasing plates
Cleaning of the plate with ammonia before the first adhesive coat : In prerequisites, glass plates will have been cleared of the coat of gelatin […]
Printer layer
Adhesive coat
Preparation of the adhesive coat (between glass and sensitive coat): prepare the aqueous mixture by adding a junior solution of silicate of soda or potassium […]
Bichromated gelatin
SECOND COAT – DICHROMATED GELATIN (coat sensitive to U.V.) Quantity of preparation (in cubic centimeters by square decimeter cc / Dm2) : whatever is the […]
Photosensitive gelatin
The wet gelatin is a compound very sensitive to the temperature. It liquefies in 86 ° F approximately, where from the difficulties maintaining a resistant, […]
Spreading of dichromated gelatin
To spread the bichromatée gelatin to a most uniform possible way over plates, we make sure at first that these are perfectly of level on […]
Collotype safely without dichromate
Phototypie sans bichromates. Des réactifs, tel le diazidostilbene, peuvent être utilisés pour préparer les plaques pour la phototypie. Collotype without dichromate. Reagents, such as diazidostilbene can be used to prepare collotype plates.