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AATCC TM163 is a test method designed to evaluate the potential for dye to transfer between different colored fabrics during prolonged storage. This phenomenon, distinct from sublimation, often occurs when garments are folded with light and dark shades in contact, and is intensified by moisture and humidity. The test simulates these conditions by sandwiching a dyed fabric specimen between a wet multifiber test fabric and another wet white fabric. This composite is placed under pressure in a Perspiration Tester and held in a high-humidity environment for 48 hours at room temperature, with an optional accelerated test at a higher temperature for 4 hours. After the exposure period, the adjacent white and multifiber fabrics are dried and evaluated for the degree of color staining using standard scales, such as the Gray Scale for Staining. This method helps predict product performance and assess the impact of specific dyes and finishes on color stability.