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Reference.org
Erythrosine
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<p>Erythrosine, also known as E127 and Red No. 3, is an <a href="/facts/Organoiodine_compound/P6LDC4IP">organoiodine compound</a>, specifically a derivative of <a href="/facts/Fluorone/6weoCyMP">fluorone</a>. It is a red-pink <a href="/facts/Dye/9tHyErlh">dye</a> used for <a href="/facts/Food_coloring/ueFCSxvC">food coloring</a>, cosmetics, <a href="/facts/Hair_coloring/NyeYhUUF">hair coloring</a>, pet products, and diverse industrial colorings. It is the disodium <a href="/facts/Salt_(chemistry)/lsSKwGpn">salt</a> of 2,4,5,7-tetraiodo<a href="/facts/Fluorescein/8E4xH5at">fluorescein</a>. </p>