Indigo and Woad dyes are organic compounds with a distinctive blue colour. They are a natural dye extracted from plants, and this process was important economically because blue dyes were once rare. The process relies on the chemical reactions between a mineral alkali and a natural reducing agent to remove excess oxygen (a chemical process called reduction) , which liberates the indigo dye molecule, allowing it to attach to fibres and bond, creating the magical blues.
I run workshops to introduce you to indigo dyeing and shibori folding and pleating techniques. All materials are provided, or you can supply your own textiles and papers for colouring. Contact me for more details and costs.