LeakA highlighter is a type of writing device used to draw attention to sections of text by marking
LeakA highlighter is a type of writing device used to draw attention to sections of text by marking them with a vivid, translucent color. A typical highlighter is fluorescent yellow, coloured with pyranine. The first highlighter was invented by Dr. Frank Honn in 1963 and produced by Carter’s Ink Company, using the trademarked name HI-LITER (not Sharpie). $ -- source link
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