Anyone seen this on Kems before? Just bought some and the majority of them have a crackled finish on them. Heat maybe?
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That is strange. Never seen that on cards before. Looks like finish checking, similar to something you see on an original nitrocellulose lacquer finish. This is something that takes 40+ years to show up naturally on guitars. This occurs as the finish expands and contracts with the wood of the guitar, due to change in humidity. Not saying its the case with your cards, but looks very similar. Here is a pic of one of my acoustics made in the late 60's showing heavy checking.