大自粉、滑石粉、石膏粉外观很相似,都是白色粉末,一般缺乏经验的同志极易混淆。除去采取正规的化学试验方法鉴定以外,在施工现场可以用比较简单的方法,把大白粉、滑石粉和石膏粉正确地区别开来。手捻:取欲鉴别的白粉,用手指捻动。有发滑感觉的是滑石粉; Large self-powder, talcum powder, and gypsum powder are similar in appearance, and all are white powder. Generally, inexperienced comrades are easily confused. In addition to the formal chemical test method identification, large white powder, talcum powder, and gypsum powder can be correctly distinguished at the construction site using relatively simple methods. Handcuffs: Take the white powder you want to identify and move it with your fingers. It is talc that has a slippery feel;