The egger duplicating material is a proven negative mold material of a type of hdyrocolloid. Due to its transparency the material is especially suitable for processing with the light-curing technique. The material can also be used for processing acrylic cold polymerizates and silicone cold vulcanizing material. The material is characterized by its extremely high reproduction accuracy. It can be reused several times. Ready-to-use material for fast processing e. g. in a microwave oven suited for small numbers.