Hi Alf Walt Wright's technique is described here: http://www.k4vb.com/Walt's%20BIO%20reduced.htm And Dennis Murrell's take on it is described here: http://www.bwrangler.com/lche.htm all the best Gavin **************************************************** * General Information About BEE-L is available at: * * http://www.honeybeeworld.com/bee-l/default.htm * ****************************************************