What is the aggregation of dyes?

Due to the direct collision of dye molecules, they aggregate into larger dye aggregates (or dye associations). These larger dye aggregates are deposited on the fabric during the dyeing process, causing color stains.

When dyeing:

The free dye molecules will recrystallize during the heating (or cooling) process to form new crystal grains;

In the process of heating up (or cooling down), the free dye molecules will gradually adsorb on the surface of the original dye crystals, making the original dye crystals grow from small to large;

The dye particles in the free and semi-free state will directly collide and aggregate into larger dye aggregates without being dissolved. These larger dye aggregates are one of the important factors that cause color stains.

In the color development (or fixation) process of dyeing, strong cohesion between the dye molecules will cause the dyes to aggregate and cause color stains. Its characteristics are distributed and irregular.