When it comes to resistance to fading from repeated washing, nylon fabric is generally more resistant compared to viscose fabric.

Here's a more detailed comparison:

  1. Fiber Composition:

    • Nylon is a synthetic polymer-based fiber, which inherently has better color fastness and resistance to fading compared to the regenerated cellulosic viscose fiber.
    • The chemical structure of nylon is more stable and less susceptible to color degradation during washing.

  2. Dye Absorption and Retention:

    • Nylon fibers have a higher affinity for dyes and can better absorb and retain color pigments compared to viscose.
    • The dyes used on nylon fabrics are typically more resistant to the effects of water, detergents, and agitation during washing.

  3. Fiber Structure and Surface Characteristics:

    • The smooth and uniform surface of nylon fibers helps to minimize color loss and maintain the original appearance of the fabric.
    • Viscose, on the other hand, has a more irregular fiber surface and structure, which can lead to increased color loss and fading over time.

  4. Resistance to Abrasion:

    • Nylon fibers are generally more resistant to abrasion and physical wear during washing compared to viscose.
    • The abrasion resistance of nylon helps to preserve the color and surface integrity of the fabric.

  5. Washing Frequency and Conditions:

    • Viscose fabrics may be more susceptible to color fading with frequent washing, especially in hot water or with the use of harsh detergents.
    • Nylon fabrics can better withstand repeated washing cycles without experiencing significant color loss.

  6. Finishing Treatments:

    • Certain finishing treatments, such as color-protecting coatings or chemical treatments, can help improve the color fastness and fade resistance of both nylon and viscose fabrics.
    • However, the inherent properties of nylon make it generally more resistant to fading compared to viscose ,  viscose rayon  even without specialized finishes.

It's important to note that the specific resistance to fading can also depend on factors like the quality of the dyes used, the fabric construction, and the overall care and handling of the garment. But in general, nylon fabrics are considered more resistant to color fading from repeated washing compared to viscose fabrics.