Crust:
light leather not treated after tanning, but only dehydrated: usually they are tanned by chrome or vegetable.
Pelt:
general term used for shaved leather. This terms is also used for shearling in its natural state.
leathers in brine:
leathers treated in advance with a solution of salt and acid.
Wet Blue:
term used to identify every chrome leather and still damp. Blue is its typical color, due to the use of chrome.
Wet White:
leather treated in advance without chrome. It is characterized by its white color.