On Tue, 15 Nov 2016 20:23:55 -0800, you wrote:
>Thanks Dwayne. The phenolics I've looked at online (mostly ebay) are as you
>say, brown. I'm curious how we arrive at a green color like the originals I
>have.
>
>
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>The color situation has been most frustrating - pictures are not reliable of
>course - on websites I see what looks like almost the exact color but in
>samples it's completely wrong.
>
>
>
>When you speak of dots and tape, you're referring to prototype boards or
>production?
Twice (or 4x) black crepe paper tape and black dots on acetate,
photographed onto Kodalith film (reduction to life size) used as a
master negative for photoetching.
For dual side boards, they had a red and blue transparent tape that
was photographed with panchromatic film (not ortho), and illuminated
with the complementary color of light.
There's a very distinctive style that dates the boards.
Can be used for prototypes or production, since it depends only on how
many you want to make.
Harvey
>
>
>
>From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
>Sent: Tuesday, November 15, 2016 9:41 AM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: Re: [Homebrew_PCBs] Dyeing PCBs for a vintage look
>
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>
>
>Many of the old PCBs were made with phenolic PCB material. The color varies
>between brown to various shades of beige.
>
>You can still purchase bare (blank) copper-clad phenolic PCB material.
>
>Another characteristic of old PCBs is that the layout is often done by hand,
>using crepe dots and crepe tape in various widths. Even earlier layouts
>were strictly hand-drawn - no tape or dots.
>
>dwayne
>
>
>At 01:08 PM 11/12/2016, 'Brad' unclefalter@...
><mailto:unclefalter@...> [Homebrew_PCBs] wrote:
>
>Hey guys,
>
>I have recently heard of some methods of 'dyeing' PCBs to achieve coloration
>closer to what vintage PCB stock looked like. I'm wondering if any of you
>have experience on this, what works, etc.
>
>I recently acquired some original, untouched Mark-8 computer boards:
>http://bradhodge.ca/blog/?p=826
>
>I'm hoping to use them to help create replicas. But I just can't get the
>PCB to look the way I want. They look too modern. I've heard dyeing can
>help, and that one can even fake the fab house marks somehow.
>
>I'm surprised there isn't a stock of vintage copper clad out there
>somewhere. Seems to be vintage everything else these days in electronics..
>
>Brad
>
>