04-16-2012, 04:05 AM
The bath halts the acidic attack on the leather. The blackness results from the time left on the leather (or you keep coating the leather with more solution). If you let the acid keep going (to drying out) without neutralizing it, the leather fibers ARE damaged and very stiff. See if the are any images on You Tube or Google. I'll try to find the links I used...
Cheryl Boeckmann