Iron

FERROUS SULPHATE

Iron is not a dye or a tannin — it is a metal mordant and colour modifier.

We have included it here because it shows up so often in our colour samples. Iron will always interact with tannin to form a black. In fact the formation of a black is a test for the presence of tannin. Depending on the concentrations the results may be light greys. Iron will darken or “sadden” the colours of other dyes while increasing their fastness. Iron may have an adverse effect on both cellulose and protein fibres. We recommend never using it above 4% WOF. In our colour samples it is used at 2% WOF. The unwanted presence of iron can stain cloth, create blotches, spotting and ruin dyeing. For this reason cracked enamel and rusted pots are to be avoided. When using iron, be meticulous about cleaning. Ferrous may also be used as a reducing agent in an indigo dyebath.

See the MAIWA GUIDE TO NATURAL DYES

BUY FERROUS SULFATE

Below: Iron 2% WOF