The wonderful thing about being addicted to soapmaking is that I find myself traveling down paths of knowledge that I wouldn’t have voluntarily tread myself.
Take last night, for instance, when I was agonizing over how I was ever going to make blue soap. I could use iron oxide, but the list of Malaysian suppliers I found on the net didn’t specify anything about their products being cosmetic grade. And I’m not looking to import anything yet–the small quantity I need doesn’t justify the massive shipping costs.
Then I found a site that mentioned Indigo powder as a natural blue soap colourant. That was exciting. Many, many clicks and a couple of hours later, here are a few (possibly eyebrow-raising) facts about indigo I’ve gathered to satisfy your curiosity about the stuff. It’s by no means exhaustive.
Indigo powder is the dried and crushed leaves of the indigofera tinctoria shrub, commonly found in India. And THIS is what the powder looks like:
Yup, it’s green. Not blue. If I’m not wrong, the blue indigo colourants you might come across in soapmaking sites is actually the hydrated indigo leaf powder which is then freeze-dried into crystalline form.
Indigo is known as “neel” in India. It’s used to colour hair (!!) without the use of artificial chemicals, anything from brown to blue-black, to black. I learned that from reading this page at Â Joy Minerals.
It’s the same dye that’s used to give jeans that characteristic blue.
Want to see what another soaper has done with indigo in her soap? Check out Southern Soapers’ tutorial here.
I’m hoping to do my own experiments with indigo really soon! Got any stories to share about this ingredient?