Just to be technically correct, we should note the chromogenic films are silverbased and Ilford's XP2 is no exception. The silver is bleached out during processing so the negative image is dye based and has no silver, but the unexposed film has silver salts as do other full colour chromogenic films. TOM GORE, BIOLOGY PHOTOGRAPHY LABORATORY, UNIVERSITY OF VICTORIA BOX 1700, VICTORIA B.C. V8W 2Y2, CANADA VOICE (604) 721-7134 FAX (604) 721-7120 E-MAIL [log in to unmask]