Abstract: The invention relates to a system for moulding coloured synthetic products, comprising at least one moulding apparatus for moulding synthetic products, a dye dispensing apparatus, and at least one collector to collect dispensed dyes comprising. The dye dispensing apparatus comprises a plurality of containers, each container configured to hold a liquid polymer dye, and a dispensing unit for dispensing one or more dyes from one or more of said plurality of containers. The moulding apparatus comprises a connection device configured to connect the collector to the moulding apparatus for introduction of the dispensed dyes in the moulding apparatus.