This section is from the book "Chromatography; Or, A Treatise On Colours And Pigments, And Of Their Powers In Painting", by George Field. Also available from Amazon: Chromatography, or A Treatise on Colours and Pigments, and of Their Powers in Painting.
Madder Purple, Purple Rubiate, Or Field's Purple, is a very rich and deep carmine, prepared from madder. Though not a brilliant purple, its richness, durability, transparency, and superiority of colour, have given it the preference to the purple of gold preceding, and to burnt carmine. It is a pigment of great body and intensity; it works well, dries and glazes well in oil, and is pure and permanent in its tints. It neither gives nor sustains injury from other colours, and is in every respect a very perfect and eligible pigment.
There is a lighter and brighter sort, which has all the properties of the above with less intensity of colour.