How did you obtain the best alkanet color, IYE?

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I've only coloured soap with alkenet once, bout a year ago. I got nice dark purpley color. I added about 1 tsp ppo. I know some people prefer infusing their oils but this was a last minute addition :)
Hope that helps!
I infuse olive oil with powdered alkanet. Then use about 25g of oil to colour about 750ml soap batter. Gives a nice dark purple. It will fade a bit over time. Keep the soaps dark in storage.
Infused in oil, then poured off the solids on the bottom. And a little indigo on the water made a nice dusky purple on a lavender bar.