A process formerly used for making photographic prints,using a finely precipitated platinum salt and an iron salt in the sensitizing solution to produce prints in platinum black.是什么意思_A process formerly used for making photographic prints,using a finely precipitated platinum salt and an iron salt in the sensitizing solution to produce prints in platinum black.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句