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单词
gum bichromate process
释义
WordReference Random House Unabridged Dictionary of American English © 2024
gum
′
bichro
′
mate proc′ess,
Photography, Printing
a contact printing method in which the image is formed on a coating of sensitized gum containing a suitable colored pigment and potassium or ammonium dichromate. Also called
gum
′
dichro
′
mate proc′ess.
1895–1900
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更新时间:2025/10/15 0:37:20