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by Sir_Vival 2602 days ago
The wet plate collodion process is only sensitive to blue/UV light. Those tattoos must fall elsewhere in the spectrum.

As an aside, I've just started doing them myself and it's clear why there's been a resurgence. Scans don't really do them justice, and the aforementioned sensitivity makes freckles/other features really stand out. It's also really hard, and takes a good 5-10 minutes per shot.