This International Standard specifies a method for the qualitative evaluation of the tendency of some colouring materials to "bleed off "or to migrate from a plastic material into other materials, if they are in close contact with each other.
If the properties of different colorants have to be compared, they should be compounded with a given plastic in a suitable standardized formulation.
BS EN ISO 183:2000 history
1979BS EN ISO 183:2000 Plastics - Qualitative evaluation of the bleeding of colorants