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What substance is added to an ink marker to make it 'permanent'?

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What substance is added to an ink marker to make it 'permanent'?

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  1. Felt tipped pens and markers have ink that is either water-based or alcohol-based.  Water-based ink can be wiped off with a wet cloth.  Alcohol-based ink is called permanent because you can't wash it off with water - although it comes off with alcohol or white spirit.


  2. Permanent markers use ink that is soluble only in alcohol.
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