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My daughters do that with fingernail paints. Then dip false nails in it.

Glue n go, as they say.

Go slow and lite, with wiping. Give the solvent time to dry, too much will dissolve and pull the paint/marker out of the recesses. The alcohol can have some effect on some plastics, but not like...

Done by hand.

Carefully fill the stamps, let cure, then remove any excess with a rag, moistened with lacquer thinner. Mined you, their horn. For plastic, I've used denatured alcohol.

Like...

Painted dark green, then wiped to reveal the highest spots.

Opposite of filling stamps.

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