Several months ago there was a disucssion regarding food colorings and dyes that are tolerated in PCR. Can anyone recap that information or direct me to specific reference?. Thanks. Jim Wick E-mail: wick at cris.com Phone: 414-871-7199 FAX: 414-871-1273 Snail Mail: 5520 W. Burleigh St. Milwaukee, WI 53210 "Don't precipitate more than you can resuspend"