I heard about this issue, and sure enough, my two boxes (with expiry dates 2027) have no notch codes. Luckily, I could tell by touch, which side was which... That's just dumb, MACO. Dumb!

Touch with moist lip both sides...if it sticks THATS the emulsion
(well it worked with the old 1/4 plate glass plates I used to use - donkeys years ago) ....worth a try.![]()

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