Cliff Claven lives!!! At 09:28 AM 7/7/2008, Barry Gallegos wrote: >Very nice Jack, Thank you very much. > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson >Sent: Monday, July 07, 2008 9:12 AM >To: [log in to unmask] >Subject: Re: [TN] PCB color > >Here is the answer from the previous TechNet discussion: >(Ioan, your memory is not so good...., grin) > >The green color of soldermask was chosen after extensive testing by the >U.S. >military at the National Materials and Procurement Center in Cedar >Bluffs >Virginia in late 1954. According to Colonel Robert Bright, Public Liason >Officer, the particular shade of green was found to provide the maximum >contrast to the white silkscreen ink under all tested adverse situations >while still allowing a clear view of the underlying circuitry. Every >other >color tested failed to provide the required contrast under conditions of >low >/ high illumination levels and various colored light sources. >The quantity of Printed Circuit Boards purchased by the Defense >Department >established a "de facto" standard which most vendors began to follow. >Usage >of other colors is permitted for prototype and or pre-release boards. > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 15.0 >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 or (re-start) delivery of Technet send e-mail to >[log in to unmask]: SET Technet NOMAIL or (MAIL) >To receive ONE mailing per day of all the posts: send e-mail to >[log in to unmask]: SET Technet Digest >Search the archives of previous posts at: >http://listserv.ipc.org/archives >Please visit IPC web site >http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional >information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 >ext.2815 >----------------------------------------------------- > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 15.0 >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 or (re-start) delivery of Technet send e-mail to >[log in to unmask]: SET Technet NOMAIL or (MAIL) >To receive ONE mailing per day of all the posts: send e-mail to >[log in to unmask]: SET Technet Digest >Search the archives of previous posts at: http://listserv.ipc.org/archives >Please visit IPC web site >http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional >information, or contact Keach Sasamori at [log in to unmask] or >847-615-7100 ext.2815 >----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------