Luteolin from

Mareck, U. et al., The 6-C-chinovoside and 6-C-fucoside of luteolin from Passiflora edulis. Phytochemistry, 30, 3486, 1991. 

Flavonoid Flavones ° Luteolin From Reseda Weld ... 

The principal dyes used by medieval dyers were indigo from woad for blue, alizarin and purpurin from madder for red, and luteolin from weld or cro-cetin from saffron for yellow some had been used long before the Middle Ages and weld was known in the Stone Age. Organic pigments have also been used on manuscripts, notably saffron, weld, indigo, woad, Tyrian purple, madder and carmine. 

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