Analysis of information sources in references of the Wikipedia article "Buckskin (leather)" in English language version.
Genuine Indian-tanned buckskin is, properly speaking, not tanned at all. Tanned leather has undergone a chemical change, from the tannin or other chemicals used in converting it from the raw hide to leather. Buckskin, on the contrary, is still a raw skin that has been made supple and soft by breaking up the fibers mechanically and has then merely been treated with brains and smoke to preserve its softness. In color and pliability it is somewhat like what is called chamois skin, but it is far stronger and has the singular property that although it shrinks some after wetting and gets stiff in drying, it can easily be made soft as ever by merely rubbing it in the hands.
Genuine Indian-tanned buckskin is, properly speaking, not tanned at all. Tanned leather has undergone a chemical change, from the tannin or other chemicals used in converting it from the raw hide to leather. Buckskin, on the contrary, is still a raw skin that has been made supple and soft by breaking up the fibers mechanically and has then merely been treated with brains and smoke to preserve its softness. In color and pliability it is somewhat like what is called chamois skin, but it is far stronger and has the singular property that although it shrinks some after wetting and gets stiff in drying, it can easily be made soft as ever by merely rubbing it in the hands.