colour fast 
adjective
Dyed in colours that will not fade or be washed out.One word of caution - batiks are not colour fast....
- Be sure to test in an inconspicuous area prior to use, to ensure that the fabric is color fast.
- Natural dyes are not sufficiently colour fast to use in the manufacture of our carpets.
Derivatives
colour fastness
- Remember peroxide is bleach so test an inconspicuous spot first for color fastness.
- Test your different textiles for color fastness and degradation to long-term ultraviolet exposure.
- How do you find out the color fastness of the pigment in your favorite tube of paint?