Color Grade

The degree of reflectance (Rd) and yellowness (+b) as set by government criteria and measured by the high volume equipment determine the color grade. The degree of pigmentation is indicated by the degree of reflectance and yellowness of a sample. The point on the color chart for American Upland cotton where the Rd and +b values cross yields a three-digit color code.

Rainfall, cold, insects, fungus, and stains from contact with soil, grass, or cotton-plant leaf can all influence the color of cotton fibers. Excessive moisture and temperature levels during storage, both before and after ginning, can also have an impact on color. Color degradation caused by environmental factors has an impact on the fibers' capacity to absorb and retain dyes and finishes and hold dyes and finishes and is likely to reduce processing efficiency.