Early Edition of Luminous Marked Cards (China) - Through The Lens

The “luminous marking system” is a general system for any kind of ink that can be viewed as a different colour through a special lens, but is essentially invisible to the naked eye. Many systems exist and can be extremely simple or extremely complicated .

This particular set is a recent, but early attempt from China suppliers to print marks onto cards. These cards are marked, resealed by the suppliers and sold to the mass market, sometimes in convenience stores.

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