[ Don Teach wrote in 140316 MMDigest:

> The most pristine decals are a blue color with a hint of green.
> Did time age them to a greenish color?

I used to be a house painter back in the 1980s and the old guy
I worked for started in the 1920s.  Bill told me a number of times
that they never painted the outside of houses blue in those days
because the blue pigments in those days faded really badly, and
quickly as well, and usually to an awful greenish color.  The sash
paints were more expensive then and so if someone wanted blue on
a house, they would usually paint that with "cobalt sash blue".

The underside of porch ceilings were usually painted a sky blue,
but the ceiling was out of the direct light so it held up better.
Flies don't like the color, and nest building insects won't build
nests on blue for whatever reason, so that kept fly spots and wasps
away.  The coal tar dyes really opened up the door for color, but
blue was unstable for whatever reason.  Cobalt blues were stable,
but expensive.

Bill was a sharp guy and really knew a lot about pigments and
painting.  I'm sure your decals will look nice, Don.  Good luck
with the project now!

Earl Hennagir