Basification

In the process of basification, the top layer of the crust becomes basic, while the lower becomes ultrabasic acquiring the density of the mantle or an even greater density

Thereafter, the pH is increased in two stages (basification and then neutralization) to facilitate aluminum complexation and fixation.

Early basification applies when the tannage is basified right at the start of the process: the solution of the basifying agent is added immediately after adding the chrome in solution.