I always preferred the red and blue myself.  A couple of times a year,=20
one of our local TV stations promoted some of the old 1950s sci-fi and=20
monster movies in '3D'. Some of the local fast food joints supplied a=20
pair of the special eye glasses to view the 3D effects.  One red lens=20
and one blue lens.  We'd always grab a handful of these.  They made it=20
easy to check your artwork.  Close your blue eye and all you'd see were=20
the blue traces and vice-versa.  Today's equivalent of turning off a=20
layer....but you can use both eyes now.

Bill


On 8/18/2016 11:15 AM, alan.b.pearce@stfc.ac.uk wrote:
>> and blue/red tape on plastic (Bishops Graphics...remember them?)
> Oh, yes, those were the days. And black tape for single sided boards and =
pads for DS ones.
>
> Still like to make my outside layers blue and red on screen because I gre=
w up with these during my apprenticeship.
>
>
>

--=20
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