亚洲网紅露点

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gum bichromate process

noun

  1. 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.
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亚洲网紅露点 History and Origins

Origin of gum bichromate process1

First recorded in 1895鈥1900

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gum benzoingumbo

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