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Sodium Alginate is a extract of seaweed, used by Molecular Chefs for the spherification process. It forms a gel in the presence of calcium ions. Sodium Alginate is a gelling agent that dilutes when cold with strong agitation. It can be used to create soft or firm gels, ambient, heat-resistant gels and can also be used to produce foams. Sodium Alginate is also commonly used as a thickener, emulsifier and texture improver.