... grain, which can pass the 4mm aperture standard sieve Industrial GelatinIndustrial Gelatin is light yellow or brown grain, ... 4mm aperture standard sieve. It is mainly used in photographic paper, bill spread the nature, fixature, printing & dyeing, ... polishing coating, emery cloth, sand paper, ink , rubber padding, leather polishing ,dyeing and weaving, paper making, handicraft glues, match , ...