Anne's indigo is the only indigo I'll use in my soap. It's absolutely perfect all the time! I get consistent colors with each batch of soap, and with each order of indigo and have for years. I spent about 2 years trying to make blue soap. The only cure for my soapy sadness was finding Anne's indigo! If you make soap, and want a natural blue, this is the one and only you'll ever want to use. Shown here (top to bottom) Anne's Alkanet, Himalayan Rhubarb, Indigo, and the uncolored soap base.