I've been on several projects that have used this scheme to denote various revisions of prototype boards. We typically used green for the first version, and then started with red for the next version of the board. If the board significantly changed size/shape we would start again at green. As I recall, we were not charged extra by the board shop for the colors. Regards Joe Joe Morrison Chairman, International Cadence User Group Director of Technology Automata Design, Inc 601 Gates Road, Suite W1 Vestal, NY 13850 [log in to unmask] http://www.adiva.com 607-727-1387 fax: 607-231-4595