Activated bleaching earth for castor oil 1. High bleaching efficiency 2. Fast filtration rate 3. Low oil retention 4. ISO. Activated bleaching earth for castor oil 1)Raw Material: High quality bentonite and high quality concentrated sulfuric acid.2)Feature: Sub-white powder,odorless,tasteless,non-toxic3)Usage:♦Used for decoloring, refining and purifying industrial oil, such as lubricating oil, ...