| 单词 | hydrotype | 
| 释义 | hydrotypenoun  hy·dro·type     : a positive printing process in photography that uses a gelatin-coated plate containing dichromate on which appears after the plate has been exposed to light under a positive and then soaked in a dye solution a positive image of dye that is transferred to a sheet of paper coated with soft gelatin    | 
	
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