Self-destructing Ink for Short Lived Promos?

Okay, I’ll admit I’m not sure how this could actually be useful in a promo, but some creative soul will surely figure it out eventually. This is a disappearing ink that starts off dark purple but gradually fades over time. Apparently it gets faint after a few hours and is gone within a day. The paper can be reused about 30 times. (via The Adverlab)

self-destructing ink

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