What are the methods for testing and improving color fastness to light?

1. Test method for color fastness to light

The light fastness test refers to placing the textile samples together with a set of blue wool standard samples under the artificial light source and exposing them to the specified conditions, and then comparing the two colors to evaluate the color fastness.

2. Ways to improve color fastness to light

The photobleaching mechanism of dyes is very complicated, but the main reason is that the dyes are excited after absorbing photons, and a series of photochemical reactions occur to destroy the structure, resulting in discoloration and fading. The light fastness of textiles mainly depends on the chemical structure of the dye, as well as its aggregation state, bonding state and mixed color combination.