C20H13N2O4SM∗. (M∗ = Na, Ba or Ca). Pigment Red 49 (15630). Pigment made by combining the intermediates, tobias acid and beta-naphthol. This type of red is available as sodium, barium, and calcium toners, also lakes; the sodium is the lightest shade, the barium is what may be termed a medium shade, and the calcium lithols are deep reds and maroons.
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Gooch, J.W. (2011). Lithol Red. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_6981
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