These highly concentrated and homogeneously coloured liquid pigments are designed for the colouration of acrylic resin systems. They are easily mixed and possess a strong colouring power (50 g is enough for approximately 2.5 to 8.0 kg casting resin depending on the colour being used.) Recommended quantities according to colour: black and white 2%; yellow and red 1%; blue 0.6%. An excess of pigment can extend the working time up to many hours or even completely prevent any curing at all. The maximum quantity that should be added is 2%. Different colours can be mixed together in order to make new colours.