1815 R. Brown 96 Indigo, madder purple, and burnt sienna.
1835 T. Thomson in 1 15 Madder Purple... The depth of the purple depends upon the strength of the iron mordant.
1965 O. Lakela 131 Sepals and lateral petals linear, acuminate, madder-purple, reflexed or pointing upward in anthesis.
2008 N. Eastaugh et al. (new ed.) 251/2 Madder purple was available in such small quantities and was consequently so expensive that its use was confined to watercolour.