colorWeldColors & materialsA yellow dye from Reseda plants, bright on wool with mordant. Not saffron, and not woad.Also known as Dyer's broomWeld is used in Dye.Pliny’s Natural History treats weld and related yellow plant dyes among cloth colorants. A Roman-era dye use of the yellow weed, not orpiment as a mineral yellow and not a modern paint chip.from Pliny the Elder · Natural History, c. 77 CEused in · sourced · documentedsourcesNatural History · Pliny the ElderPliny, Naturalis Historia.