Materials for direct-positive colour-print cameras 直接彩色照相材料
positive colour film 彩色正片
colour positive film 彩色正片
colour positive film developer 彩色正片显影液
Colour positive 彩色正片
colour r positive film 彩色正片
The colour of a liquid changes to give either a positive or negative result.
BBC: Cheap colour test picks up HIV
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