Hydrocolloid-based material as concentrate for negative molds. Due to its transparency the material is especially suitable for the light-curing technique. The material can also be used for processing acrylic material for cold polymerization and cold vulcanizing silicones. Savings in handling costs are granted due to a lower weight. The material can be reused several times on condition that the manual instructions are observed. A mixture with 1.5 l water produces about 5.3 kg.