I was checking some Canadian stamps for tagging and a couple Netherlands stamps on the desk were glowing - obviously printed on phosphorescent paper (the other ones still looked dull).
1) I looked in my Scotts 2017 Catalogue and can't find a listing for a 6c phosphor version. Does anyone know of such a listing?
2) The 8c is listed as #406 in phosphor - but Unwatermarked. My copy has the circles watermark, but I can't find a listing for that version either. Anyone know what it would be?
Many thanks.
Dave
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Stark white sounds very much like optical brightener.
Fluorescence is mostly yellowish and remains visible while the (long wave) UV lamp is on, phosphorescence often reddish, sometimes purple-ish, but is visible as an afterglow once you remove the (short wave) UV lamp.
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