black reverse culatta leather keychainthe minimalist keychain has been hand cut from a butter soft full grain washed 3. 2mm vegetable tanned reversed culatta leather with a rotten corpse matte black dye finish. culatta is a special cut combined of the rear just above the cordovan, the belly middles and the hind shanks, offering a dense structure, tight grain and medium to firm temper. vegetable tanning is a traditional method of treating the hide using natural extracts such as tree bark,