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STONE leather created using calfskin is full-grain leather that has been treated to give it a rubber-like appearance with a very mat finish.
The rubber finish makes this material a bit more susceptible to finger marks and slightly oily substances. These can create darker marks. However, these fade rapidly after rubbing with a soft, clean and dry cloth. Its rubbery feel is particularly soft to the touch even if the finish tends to make it dryer - one consequence of which is that folds are more likely to leave marks if the product is not stored away correctly. We recommend filling it with paper when not in use in order to avoid fold marks appearing as once they appear, they run the risk of being permanent.