Solvatochromic dyes are used herein to indicate the presence of bacteria by incorporating them into various substrates such as films, woven and nonwoven fabrics, paper towels, coform and airlaid materials and bonded carded webs. These dyes change color in response to a change in polarity of the environment....http://www.google.fr/patents/US20050130253?utm_source=gb-gplus-shareBrevet US20050130253 - Solvatochromatic bacterial detection
