Many German stamps(SBZ,BIZO,DDR etc.) supposed to glow under UV light. I have Long Wave source (possibly not powerful enough), but I cannot see anything, not a single stamp. Do I need a short wave for those stamps? Thanks
Probably so. I have a Lighthouse UV lamp that does both long (380nm) and short (254nm), and I've noticed that earlier German stamps will only show color changes under short.
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