Depends on which surface is an original bond and which surface is laminated in process. Relative opacity could just be prepreg type, processing requirements. Color largely irrelevant. It's a sign that their process has changed, though, so you'd best be on your guard for more serious deviations. RL ----- Original Message ----- From: Genny Gibbard <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, February 26, 2002 9:59 AM Subject: [TN] The board looks funny... > 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 > -------------------------------------------------------------------------- ------- > --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------