Ozone fading is caused by ozone gas in the atmosphere. It is also accelerated by high humidity and heat. Ozone is more prevalent around electrical motors,fluorescent lights and during lightning storms. It is also formed by a reaction between light and other pollutants in the air. Fibers subjected to ozone fading my lighten, turn white, or change form one color to another as in fume fading above.
Some carpet fibers are dyed with Indicator Dyes. These dyes are sensitive to either acid or alkaline chemicals. An alkaline sensitive dye will change color if exposed to ammonia or a high alkaline detergent. the color can be changed back with dilute acetic acid. An acid sensitive dye will change color when exposed to vinegar or other mild acids used in cleaning. The original color can be restored with dilute ammonia. These color changes may not be permanent and can often be reversed. However, other color changes due to strong chemicals are not a result of this indicator effect and may not be reversible.
Color changes that may become apparent after cleaning are sometimes incorrectly blamed on the cleaner or cleaning process. However, In many cases the color change is due to the aging of the dyes, and the cleaning simply reveals the true color.
Action Cleaning Systems Inc.