Most chemical reactions performed go back to the days of the dyestuff industry. Thiosalicylic acid is a precursor to the dyestuff thioindigo. The madder dyestuff is combined with a dye mordant. Lincoln scarlet, from its imported dyestuff, was more expensive than Lincoln green. The symmetrical diaminophenazine is the parent substance of the important dyestuff neutral red (dimethyldiaminotoluphenazine). Parts of the tree are used for dyestuff. If used as a dyestuff, the flowers give a creamy, off-white color. At Hackney Wick, Green discovered the important dyestuff intermediate Primuline. Turnsole or folium was a dyestuff prepared from the annual plant "Chrozophora tinctoria".