Shavings from Chlorophora tinctoria often called Old Fustic.
Use on protein or cellulose fibres. Requires a premordant. A classic dye that gives bright yellows through to gold or green, depending on the mordant. Use at 30-50% WOF for medium to strong shades.
TO USE: soak in water overnight to several days. Simmer 1 hour in soaking liquid. Cool, strain then simmer premordanted fibre for 30-60 minutes. Temperatures of 155-160°F will give the best yellows.
Light and washfastness: good to excellent with a mordant.