Weld (Reseda Luteola) Extract
 
Weld produces an excellent light and washfast yellow on fabrics and is a strong clear yellow to combine with indigo for emerald and leaf greens. Natural reseda dye extract is an economic way to dye all your fabrics, a little goes a long way. Weld is also known as Dyers Weld, Dyers Rocket, and Dyers Mignonette.
A great product for screen print pastes.
Learn more about using weld here.
 
Use at 3-5% Weight of fiber.
5 grams of weld extract will dye 100 gram of fabric.
Active dye component; luteolin.
Mordant protein fiber with alum 15% WOF.
For cellulose fiber pre mordant with tannin and aluminium acetate.
Copper mordant at 5% will give deep mustard yellow.
Post-mordant with 1% ferrous sulfate for khaki greens.
 
Weld loves slightly hard water.
Adding finely ground chalk (about two teaspoons for a gallon) brightens the weld colour, especially if your tapwater is soft.
A second round in the dye bath will give soft yellow hues.

This professional grade Weld extract is grown and processed in Europe and is an approved dyestuff for the Global Organic Textile Standard (GOTS )