piping
1. A defect in leather appearing as a double-skin
effect when the leather is bent or flexed, and
resulting from the grain layer of the leather
separating from the corium. It is caused by
excessive staking during manufacture or by too
great pressure during burnishing. Sheepskin,
because of the excessive fatty tissue in the
interior of the skin (especially in older
animals). is particularly affected. 2. A type of
crease or ribbing in paper caused by irregular
tension in reeling, by moisture, or because the
paper was wound too tightly after sizing. (60 , 291 , 363 )
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