Urine can affect the dyes used in carpet, although not all occurrences will result in a permanent stain. Success is dependent upon the content of the urine, the dyes, and any treatments applied to the carpet during manufacturing, the finish used, and the time elapsed after the deposit. Some urine spots may be immediately noticeable, while others may take weeks or months for a reaction. The dyes may change color immediately after contact with urine. When urine spots develop slowly and are noticed after much time has elapsed, the dyes and carpet fibers may be permanently damaged. In beige carpet, blue dyes are attacked by pet urine, leaving behind the red and yellow dyes with a resulting stain appearing red, yellow, or orange. (Download the CRI bulletin here.)