Frank, thanks for jogging my (sometimes pathetic) brain. I can't explain why, but I seldom think to use an UV light to test a card. But, I have just now done this, and both cards check out ok.
Leon, thanks for you input. The tan-backed card feels very smooth/slick (not at all rough), same as the white-backed card. Both cards feel the same.
Best to each of you,
Val
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