Nearly all leather sold today is chrome tanned. It takes about a day, produces a soft, stable hide, and gives you the leather in most bags and shoes. Vegetable tanning uses tannins from tree bark instead of chromium salts, takes weeks in pits rather than hours in a drum, and produces something that behaves differently.
The difference is not that one is better. It is that one keeps changing.
It is still reacting
A chrome-tanned hide is chemically finished. A vegetable-tanned one is not: the tannins keep responding to light and to the oils on your hands. That is why an undyed cover goes from pale sand through honey to amber over a year, and why a dyed one deepens at the spine and the front corner before it deepens anywhere else.
You cannot stop it, and there is no product that will. The change is the material doing what it does.
Dyed through, not coated
The hides we use are dyed through rather than sprayed on the face. A scuffed corner shows more leather rather than a pale patch of something underneath, and there is no topcoat that can crack along a fold.
This is worth checking on any leather goods you buy. Bend a corner sharply: if a line of lighter colour appears and stays, you are looking at a finish rather than a hide.
It is firmer
Vegetable-tanned leather holds its shape. That is why it is the traditional choice for saddlery and tooling, and why it works for a cover you want to write on: the panel stays flat under a pen instead of pillowing.
The cost is weight and break-in time. A thick veg-tan cover is stiff at first. It loosens where it folds and nowhere else.
The Consortium mark
Buttero comes from Conceria Walpier and carries the Vegetable Tanned Leather Consortium certification, which is a Tuscan trade body rather than a quality prize: it certifies the tanning method and the origin. Pueblo comes from Badalassi Carlo in the same region.
We order the hides online from Italy and do not hand-pick them. Saying otherwise would be a nicer story and not a true one.