When making an indigo vat, you require three things: the indigo extract, an alkali, and a reducing agent.
Calcium hydroxide is a very common alkali, used in several types of vats, including Fructose, Iron and Henna vats. It is a food safe ingredient, also known as pickling lime, used in processes such as pickling and tortilla making.
Use with indigo and a reducing agent to create a vat and create blue!
If you are new to indigo dyeing, you may want to begin with our Indigo Kit, which has the pre-measured quantities of each ingredient that you need, as well as comprehensive instructions.