What is Activated Bleaching Earth? Activated Bleaching Earth is a mineral clay, made from bentonite material. After acid with H2SO4, activated bleaching earth has strong absorption and decolorization power. It can remove and absorp the impurity and make the crude oil & used oil to be clear... https://www.chinabentonite.net/activated-bleaching-earth/activated-bentonite-clay-powder.html