Also known as wold or woald. A clear yellow dye obtained from the flower and the whole plant, in particular the flower of the wayside rocket plant Reseda luteola, also known as dyer’s rocket or dyer’s mignonette. It is the oldest known yellow dye in Europe, grown in the Mediterranean and used in painting and frescos as well as to dye yarn. It produces a clear, transparent colour that is also used for glazing, and in small dose to refresh wall colours.
Weld is one of a relatively small number of source for both paint pigment and textile dye.