Use alum mordant at 10% by weight of goods and dissolve it in hot water. Place this solution to one side.
For 100g of dry material use around two litres (i.e. about 20 times the weight of material) of water and add a small quantity of citric or acetic acid (vinegar) to the water to achieve 4pH.
Heat the pan to 60°C and add the alum solution and stir well. Then add the 100g wetted material to the mordant pan and heat to boiling. This should be kept at 100°C for 45 minutes. The heat is then switched off and the material is left in the pan to come down to 60°C before removing.
To develop the colour for 100g material use 10g of Turquoise Blue Indigo dye dissolved in a small amount of hot water. Place this solution to one side.
Use two litres (i.e. about 20 times of dyeing material) of water and add Citric Acid or Vinegar to give the water a pH level of 2.
Heat the liquid to 60°C and add the solution of dissolved Turquoise Blue Indigo dye. Add the 100g of mordanted material (with the alum mordant solution squeezed out) turning the material carefully whilst the pan is taken to boiling. Keep the temperature at 100°C for 45 minutes and then switch off.
Wash the material to remove unfixed dye particles from the material and allowed to dry.
Visit the website to view the Fibrecrafts range of natural dyes