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For additive and subtractive colour mixing, supplementary set for the student experiment box Optics 1 P9902-4L; Equipment set consisting of:1 x DL980-1D Three-colour filter, additive3 x P5205-2D1 Mirror for additive colour mixing SE1 x P5210-2A Colour filter subractive SE, setDimensions: 6 x 2.8 x 8.5 cmMass: approx. 65 g1The equipment set can be stored in the Optics 1 student experiment box.