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Facial mask sodium alginate
The main component of the alginate mask is algin (sodium alginate) or sodium salt of alginic acid – a compound obtained from marine algae. Another necessary ingredient is calcium sulfate. When mixed with water or water-based gel, these two powdered compounds form hydrocolloid gel, which become a depot for active ingredients, allowing their slow migration into skin.
Other cosmetic grade sodium alginate, pls refer to it.