Black masks also make it harder to hold a pcb up to the light and look
for internal traces, linx technologies uses this on their RF
transmitter/receiver boards, I think to make it just a little bit harder
to reverse-engineer stuff.  They used to just use standard green.

Or maybe I'm just suspicious b/c I think they are a little toooo pricey.  :)

J


Mike Harrison wrote:
> On Wed, 31 Mar 2004 16:04:37 -0500, you wrote:
>
>
>>>>Does anybody know of a PCB house that can do multi coloured, patterned
>>>>soldermasks on PCB`s ala. Looks very cool!
>>>
>>http://www.altera.com/products/devkits/altera/kit-parallax_cyclone_smrtp
>>
>>>>ck.html
>>>
>>>I always thought that solder masks were introduced to prevent solder
>>
>>bridges
>>
>>>on wave soldered boards. Why are they even needed in any color for hand
>>>soldered boards?
>>>
>>>John Power
>>>
>>
>>Having it in "some" color (instead of clear) is just good practice for
>>inspectability, i.e.. If it's green, then it has soldermask.
>>
>>As for multi-color and such, as stated above "Looks very cool!"
>>
>>-Denny
>
>
> ..and can occasionally be useful - a customer of mine uses a white mask to reflect light from a
> zenon tube. I have also seen black masks used for better appearence through a display window.
>
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