PHOTOGRAPHY_化学配方数据库_化工助手

化工产品及用途数据库香料库颜料库染料库化学配方数据库畅销药物查询系统药物化学大辞典 FDA药品批准信息 FDA药品独占权信息 FDA药品专利信息 DMF提交信息库

化学配方数据库

配方类型：	PHOTOGRAPHY
配方说明：	Glycerin "Sandwich" for Photography
配方组成：
配制方法：	For enlarging a photo from a wet negative, make a glycerin "sandwich," using glass carriers. To do this, a little glycerin goes onn the center of one glass, then the wet negative, then a little more glycerin topped by the other glass. Air bells are removed by squeezing lightly.