In the following pages, all the steps for the preparation of the films, printing matrices for collotype prints, and many other details are explained.
Preparation
Cleaning plates
Cleaning former coat Glass used as printing matrix for collotype having the advantage to be able to be almost reused infinitely (until accidental break), it […]
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 […]
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 […]
Exposure to light of the photosensitive gelatin
GENERAL INFORMATION ON EXPOSURE TO LIGHT : While the gelatin/dichromate/water has not been dried, ultraviolet light has no effect on the gelatin. The action takes place […]
Rinsing plates
At the end of sunstroke, we have to see the complete image, in slightly brown color, with all its details, even in its halftones. After […]
Photographic gelatin
One of the materials the most important for the collotype is the gelatin. It establishes the photosensitive stump which is going to be transformed into coat printer. Once moistened, it will push away the ink in the parts not insolated, and will hold it in the parts establishing the image…