Who What Why: How durable is a fingerprint?

"Some boys we get out of the water, the fish have been at them already and the fish will have pecked at the epidermis. But you can still get ridge detail from the underside of the epidermis. And if that has gone, then you can do the dermis. For every ridge you have on the epidermis, you have two on the dermis - we call it a tramline effect."

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