Soap Craft Lab
Ingredients/Spirulina Powder
natural-colorants1/2–1 teaspoon per pound of oils

Ingredient Deep Dive

Spirulina Powder in Soap Making

Spirulina powder produces a vibrant green color in fresh soap, but it is known to fade significantly over time, often shifting to a yellow-green or khaki tone. Best used in designs where the initial green is the goal.

Benefits

  • + Produces vibrant green in fresh soap
  • + Natural, plant-based colorant
  • + Readily available in health food stores

Potential Issues

Significant fading over weeks to months — expect the green to shift toward yellow-green or khaki. Overheating during gel phase accelerates fading. Has a mild natural scent.

Pairing Tips

Use in combination with other greens like French green clay for depth. Keep the soap cool during saponification to slow fading. Use a bit more than you think — the color fades.

Recipes Using Spirulina Powder

Browse the full ingredients guide or explore soap recipes.