MoldGel AlginateSilica free, food safe alginate, Set time: 4 5 minutes. Organic water based Molding Powder made from sea grown kelp. Used for making single use molds of body parts including child and adult hands and feet and small body parts, candles, food, soap and craft molds. Sets to a firm rubbery consistency, providing high detail down to finger prints when cast. With a 3 to 1 mix ratio, pound for pound you get double the amount of molding impression material