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.