This is a good case for using a multi-search engine. Dogpile came up empty on bleachfield with the first seven engines, Yahoo, Thunderstone, Lycos's A2Z, Excite, WWW Worm, WWW Yellow Pages, and Webcrawler. The eighth one, Lycos, turned up this site http://www.eng.uci.edu/students/mpontius/hartley/177-179_.html which describes the process exactly as Alex learned from his mother, and mentioned as bleach greens by Alison. There were 24 references in all from about 15 search engines, some of which were parts of addresses, and some which seemed completely unrelated.