Buckthorn berries also known as Buckthorn berries.
Persian berries for a good lighfast yellow. Substantive, no mordant needed. Mordants will improve light fastness and alter shades. Different Ph levels will create different colours.
Used in ink making in medieval recipes, and many traditional dye recipes in the 18th century.
These berries are 100% organic, foraged from the woods in Europe from Rhamnus cascaria.
Active dye compound; Rhamnetin.
Use at 100-200% WOF
Soak in warm water before using, boil for at least 20 minutes and filter the dye bath before adding wool or textiles.