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cordlesslamp , 5 months ago If it's cardboard or paper, they could just fold it. Use something they can't fold, like acrylic sheet or super brittle paper-like that would crumble or break if folded. What about using self-disappearing ink? LoL
If it's cardboard or paper, they could just fold it. Use something they can't fold, like acrylic sheet or super brittle paper-like that would crumble or break if folded.
What about using self-disappearing ink? LoL