How 'bout off-white, eggshell white, etc?  Sorry.  I'm not getting into this
one.  ;-)
Ray H.

----- Original Message -----
From: Bob Landman <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, June 15, 1999 6:26 PM
Subject: Re: [DC] Origin of green??


> Common fiberglass epoxy boards (help me here Ray H.) have been translucent
green
> since 196~ (when they were also blue and tan and of course phenolic boards
were
> orange-brown).  I have tried yellow silkscreen and it's very hard on the
eyes -
> we did not like it.  Also, when it is screened very thin (or narrow) it is
> translucent almost transparent whereas white is very high contrast
relative to
> green.  Also, there is yellow and there is yellow and everyone would argue
over
> the shade.  With white there is no argument as that pigment is WHITE.
Yellow,
> by the way, has to have white in it or you can't see it.
>
> Bob Landman
> H&L
>
> ----- Original Message -----
> From: Abd ul-Rahman Lomax <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: June 15, 1999 3:20 PM
> Subject: Re: [DC] Origin of green??
>
>
> > At 05:06 PM 6/15/99 +0800, Lum Wee Mei wrote:
> > >I quite like the reason Bob gave. Solder mask is green so as to blend
with
> > the light greenish colour of the
> > >printed circuit board before masked. The light greenish colour of the
> > printed circuit board if my memory
> > >does not failed me comes from the combination of the resin and epoxy
being
> > used. The percentage between
> > >them and also the woven glass cloth give a slightly different colour.
> >
> > I'd say that this begs the question. If solder mask is green to blend
with
> > the color of the plastic laminate, first of all, why should it blend?
And,
> > secondly, why should the *laminate* be green? Epoxy resin itself is not
> > green; rather it is clear.
> >
> > I've seen specifications on many drawings requiring that the solder mask
be
> > green, but I've never seen a reason stated anywhere.
> >
> > My suspicion is that, first of all, someone, somewhere, decided that a
> > particular grade of epoxy/fiberglass laminate should be colored green,
to
> > distinguish it from other grades. I couldn't find my old copy of
> > MIL-P-13949, and it is distressing to be reminded once again that,
still,
> > all these standards and their descendants are available only for sale at
a
> > fairly stiff price, and not for free download, especially considering
that
> > the MIL standards, at least, were written with public money.
> >
> > Now, another related question: why is white more or less the standard
color
> > for component legend ink when it's been considered for years that yellow
is
> > a better color to use, by those who specialize in such details (like
Preben
> > Lund), due to the increased contrast.
> >
> > I'd think that an opaque, or semi-opaque, solder mask might be easier to
> > inspect.
> >
> > [log in to unmask]
> > Abdulrahman Lomax
> > P.O. Box 690
> > El Verano, CA 95433
> >
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