Most red writing inks are a dilute solution of the red dye :
A
triphenylmethane
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B
methylene blue
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C
basic fucsin
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D
eosin
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Solution
The correct option is D eosin Pigments are insoluble, whereas dyes are soluble. Most red writing inks are a dilute solution of the red dye eosin. Ballpoint ink is usually a paste containing 40 to 50 percent dye.