"Wet-blueing"-chrome tannage by basic chrome sulphate is today an almost universal method of making the pelt resistant to putrefaction and stabilising the fibre structure producing strength, relative dimensional stability and thermal resistance.
As with all beamhouse processes the chrome tannage if not conducted correctly is very difficult if not impossible to rectify. The requirements are:
- Penetration of the chrome giving chrome contents of similar value through the cross section of the pelt. Use of suitable masking agents will assist in this task.
- Level chroming of the grain layer to produce bright even dyeing properties and good physical characteristics. Use of suitable masking agents will assist in this task.
- High exhaustion of the chrome offered to reduce waste water chrome extent.