article_snippet.sent: Engineers found that the cotton products absorb chemicals commonly used on toilet paper, laundry detergents and shampoos, which glow under UV light, meaning that Engineers could shed light on previously undetectable misplumbed pathways.
article_snippet.sent: Optical brighteners are found in toilet paper, laundry detergents and shampoos.
article_snippet.sent: ‘The main difficulty with detecting sewage pollution by searching for optical brighteners is finding cotton that does not already contain these chemicals,’ Professor Lerner said.
article_snippet.sent: Here, fluorescent powders glow under UV light .