潘金莲被吸乳揉到高潮的视频,久久99久久99精品免观看,在电影院里拨开内裤挺进,护士交换粗吟配乱大交动态图

Package: 25kg/fiber drum or as request

Uses : A developer for silver bromide gelatin emulsions that gives a gray-black, almost haze-free negative, preferred over other alkaline developers because it speeds up exposure; used in dye manufacturing and as a color enhancer in photographic developers.

Molecular Structure:

Product description: 2,4-Diaminophenol dihydrochloride (CAS#137-09-7), a hair dye, beige to gray-green crystalline powder, purity up to 99%, is used as a developer, a fur dye and a chemical reagent, e.g., it can be used as a developer for silver bromide gelatin emulsions, which can make the negative gray-black with little or no haze, and it is favored for its faster exposure speed. The regular package is cardboard drums lined with plastic bags, sealed and stored in a cool and dry place.