What is collotype printing？
Time:2024-06-04
Views:1879
Collotype printing, the glass plate for the plate base, according to the level of the original manuscript made of gelatin hardened graphics, by the gelatin hardened wrinkles to absorb ink, not hardened part of the ink through the wetting exclusion for printing.
Collotype printing is a kind of lithographic printing, is one of the earliest photolithographic printing, because of the thick sanded glass as a plate base, coated with gelatin and dichromate solution, made of photographic film, with the negative laid on the film exposure, made of printing plates. So it is also called “glass plate printing”.
The process is: grinding glass → coated photographic solution → contact exposure → development, wetting treatment → printing.
Coro plate prints the intensity of the level, can faithfully reproduce the continuous tone image, the effect can exceed the flat and letterpress prints, suitable for printing sophisticated high-level prints, it is because of this feature, the oldest photographic plate making method to maintain the continuation of this process.
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