Found this a little farther down:
When AmQuel+ detoxifies ammonia, nitrite, nitrate and other organic compounds, it breaks the links of molecules apart. The bacteria do not know the difference and eat the parts, just as they would the whole original compounds. AmQuel+ may affect the dyes in certain types of cotton fabrics. This happens for the same reason that Ammonia test kits using the Nessler reagents do not work with AmQuel or AmQuel+. These products reduce the coloring agents used in the Nessler reaction test kits, and apparently in a very small selection of cotton based fabrics.