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.
>
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