To dye yarn and linen cloth blue

Take the black dwarf elder berries, dry them in the sun and soak them in vinegar for 12 hours. Squeeze them with your hands, strain them and press it through a cloth. Put ground verdegris and alum therein. If the color should turn out light blue then add more verdegris. Lay the yarn or the linen cloth therein.

Or take blue bilberries, pour water thereon, let it soak for three or four days, put alum therein and boil it well together.

Citation Type  Fabric Dye Recipe
Citation Year 1532