Due to their waterproof and fade-resistant qualities, Sharpie markers are a standard tool for numerous arts and crafts. But it doesn't mix with leather well.
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How to get this marker ink out of real leather. : r/howto
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How can I remove what looks like sharpie from leather? : r
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How can I remove what looks like sharpie from leather? : r
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How can I remove what looks like sharpie from leather? : r