1. n. [Drilling Fluids]

A lignosulfonate that has been treated by mixing or reacting into the molecular structure some form of chromium (either chromate or chromic salt). Although still used today in less environmentally sensitive areas, it has been replaced by iron or calcium lignosulfonates. Ferro-chrome lignosulfonate is a popular type of deflocculant that contains iron and chromium salts.

See: chromate salt,  chrome lignite,  chrome-free,  conventional mud,  ferro-chrome lignosulfonate