I’ve used dye based ink (from a rubber stamp pad re-inker bottle), alcohol based markers (sharpies, copics), Krylon brand gold leafing pen and acrylic paint. I don’t use a sealer, I’m using the tiles for decoration only, in stands.
Pics are shown in the top post in this thread: Tile Trials The acorn is metallic acrylic paint, the leave is alcohol ink markers.
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