Quote:
Originally Posted by medwatt
Actually I've tried spirits like perfume and got no result. Then I tried a solution of calcium hydroxide (lime) and nothing. The stain is from a normal black bic pen.
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Perfume is usually mostly water. You really need to try something that doesn't contain water. E.g. white spirit, methylated spirit or (probably best) isopropyl alcohol (aka propanol).
cotton buds are probably the best way to apply the solvents.