We use Iron (ferrous sulfate) as a color changer, darkening or “saddening” natural dyes on cellulose fibers. It also increases lightfastness and acts as a mineral mordant for dark shades. The famous black dye recipes from the 17th and 18th century use generous amounts of iron and tannin. Iron reacts with the tannin in many dyestuffs creating colors ranging from chartreuse green to black, depending on the dye it is combined with.
• Pomegranate with iron makes a dark olive green • Madder with iron makes a deep grayish purple • Tannin with iron makes a grayed purple • Cutch with iron makes a rich chocolate brown
Our iron powder is light green and food grade. Use it either during mordanting or in a post-dye bath. KEEP AWAY FROM CHILDREN/PETS
Safe Use of Iron The iron we supply is a food grade product but it can be harmful in powdered form to young children and pets. We advise that you follow these safety precautions. • Keep the iron powder package tightly closed and store away from children and pets. Do not allow children to use iron powder unsupervised. • If ingested, seek immediate medical attention. • Measure iron in a well-ventilated area • Avoid breathing the steam coming from a hot iron mordant bath and mordant in a well-ventilated area. • When measuring iron powder, use a dust mask or respirator, apron and gloves. • Clean any spills immediately and wash utensils promptly after use. • Iron will stain surfaces, hands and clothing. • This information is not meant to freak you out but to make you aware that iron should be handled with care.