(C6H8O6) – sodium alginate – is the sodium salt of alginic acid. It is a food additive (E401) extracted from brown algae (Phaeophyta). Sodium alginate is used in food preparation and acts as a thickener, stabilizer, and gelling agent. However, please remember that the substances in your set are not suitable for use in food. In addition to the food industry, sodium alginate has a number of applications ranging from dentistry, textile printing, and pharmaceuticals to animal feed and fertilizers.