コロタイプ印刷
網目スクリーンなしの印刷技術で、この技術ではプリンタ版胴の役割を果たすのは、二クロム酸塩ゼラチンに覆われ、写真ネガの下に分離されたガラス感光板である。ゼラチンがその板の湿った部分でインクをはじき、硬膜処理された部分でインクを引き込む。結果は鉛筆、デッサン用木炭あるいは文書のハーフトーンで完全に忠実な再現となる。
このゼラチンによって500部まで印刷可能で、それ以上は版を作り直さねばならない。
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