The dark background of the painting contains bone black, weld ( luteolin, reseda luteola ), chalk, small amounts of red ochre, and indigo.
2.
Only in the 16th century was a good green dye produced, by first dyeing the cloth blue with woad, and then yellow with reseda luteola, also known as yellow-weed.
3.
Its roots have been used to make a yellow dye called " weld " since the first millennium BC, although the related plant " Reseda luteola " was more widely used for that purpose.
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