Alkannin naturally found in the root of the alkanet plant is a dye used in various applications including cosmetics. 
Alkanet is an interesting natural soap making dye as the colour reacts with the pH. Alkanet soap making infusion can start off as blue, green, grey or even red and morph into purple/violet. 
Always protect your hands/clothes when mixing our alkanet root powder.
The intensity of the purple/violet hue in your cold-processed soap really depends on various factors including but not limited to:
  • percentage of alkanet used
  • the colour of the ingredients used
  • pH of the soap
  • how the alkanet was mixed – in oil or lye solution

Always best to run a test batch starting with 2.5% of your oils/fats for soap making.