In the deliming and bating phase, lime removal takes place which must be complete, especially for technical items. A further cleaning of the grain and a relaxation of the dermal structure prepare it for tanning. It is important to choose the appropriate enzyme to avoid damaging the grain or weakening the fibers.
The emulsion of natural fats that are removed should be managed so as not to leave residues on the surface of the grain. Grease spots will otherwise be visible even on crust leather.
The use of specific emulsifiers allows a safe and uniform redistribution of residual fat, preserving the part which guarantees a grain elasticity useful for making certain articles.