The processing of the raw clay begins with its preparation i.e., the Bentonite is purified by separating and removing the accompanying natural minerals viz silica, Quartz, Mica, Feldspar etc.

ACTIVATION: The prepared Bentonite, as a fine suspension, is then subjected to the effect of mineral acid. The outer calcium ions are replaced by H+- ions at the first stage of acid activation.

A so called H-Bentonite is formed. In the course of further activation the individual layers are directly attacked by mineral acid and various ions, such as Aluminium, iron calcium and magnesium ions are removed from the lattice. The acid can now penetrate deeper and deeper from the surface of the crystal into the crystal structure of the individual layer, which result in  an increased surface area of these crystal platelets and the formation of active acid sites. At this stage, optimal acid activation is achieved. Further chemical treatment would again reduce the activity and cause complete dissolution of the crystal as well as the generation of silicic acid.

At this point, the acid activated clay has the best bleaching properties. It is obvious to capture this moment

Complete mastery over clay processing technology and experience are necessary to produce Bleaching Earths in the market with consistently high bleachibility bear evidence to the fact that we have made good mastery over the activation process. 

The activation process imparts the following properties to the crude raw material.