Willow calf is exactly the same kind of leather as box calf, except that it is dyed brown instead of black.
The soaking, liming and deliming processes are the same as for box calf.
Glac calf is made much in the same way as box calf, but there is no graining at all.
Whichever process of tanning has been used, the skins are neutralized and washed thoroughly, as for box calf, sammed and shaved.
They are now dressed to a large extent in imitation of box calf, being much cheaper.
The dyeing of box calf is generally done in the drum tumbler, but there are several other methods.