Hi, We just received a new rev of a PWB in house. It has not been populated yet. It looks like it has been built correctly - the right layer order, connections, etc - but it looks different than the rest of our 4 layer boards. Normally the traces on the inner layer that is closest to the surface appear dark in colour and the deeper layer appears lighter. This board is the opposite. The layer closest to the surface is light in colour and the deeper layer is dark. Also, the FR4 seems much easier to see through than usual. Any thoughts or explanations for this? Thanks for your time. Genny Gibbard (mailto:[log in to unmask]) --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------