I obtained a few US Postal Cards and cannot see any watermarks visually. Is it appropriate to use the Ronsonol lighter fluid to determine if and size of the watermark so I can verify UX1 or UX3?
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When I need better backlighting to see a watermark on a postal card, I use an inverted Ott light and a piece of cardboard to block the excess light. The Ott light is bright hence the need for the cardboard filter. This technique is especially helpful for sorting UX4/UX5.
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Posted 12/08/2023 10:04 am
