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1. Dye quality issue: If low-quality dyes are used for towels, their color fastness may be poor, and they are prone to fading during washing or use. High quality dyes can better bond with fibers, making towels have good color fastness and less prone to fading.

2. Improper dyeing process: Process control during the dyeing process is also crucial for the color fastness of towels. For example, inaccurate control of parameters such as dyeing temperature, time, pH value, etc. may result in the dye not adhering evenly to the towel fibers, making the towel prone to color fading in subsequent use.

3. Incorrect washing method: Using water with excessively high temperature to wash colored towels may intensify the movement of dye molecules, leading to color fading. In addition, excessive rubbing, washing with other easily fading items, or using inappropriate detergents such as strong detergents may also damage the binding between dyes and fibers, causing color fading.

4. Towel Material: Towels made of different materials have varying abilities to adsorb and fix dyes. Some natural fibers, such as cotton towels, are relatively easy to color, but if the dyeing process is poor, they are also prone to fading; while some synthetic fiber towels are more difficult to dye, but once dyed successfully, their color fastness is usually better.

In order to reduce the possibility of color fading in colored towels, it is recommended to choose products with good quality and good reputation when purchasing. When washing, try to use mild detergents and gently wash with cold or warm water to avoid mixing with dark or easily faded clothes. At the same time, new towels can be soaked and cleaned before the first use to remove possible residual floating colors.