The rosemary and lemon oil along with the other ingredients have a pleasant cooling effect on the skin while the mask is on, almost like menthol.
The rosemary leaf essential oil is regenerative, uplifting and moisturising; lemon is astringent, cleansing and refreshing.
Try adding up to 5% vegetable oils combined with oil soluable active ingredients to the powder or combine water soluable active ingredients with hydrosols to mix the mask.
You could even use a combination of oil and water soluble active ingredients for a truly potent bespoke skin treatment.
When applied as a paste to the face, it rubberises after a few minutes, due to a natural process of the alginate from the seaweeds.