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  1. india ink or what else ?

    I have used black food coloring on the exterior, which looked fine but when I used the cup with hot tea, the ink on the outside sweated off. The cracks remained dark but the ink came off on my hands, and this also happened when I washed the cup. It wasn't black black but still a bit messy and disconcerting. Don't know how long it would remain in the cracks this way either. I'm looking for a safe alternative. Shiloh