It doesn't matter that you have the "paint code" when trying to match a
paint. The mix code will get you in the ballpark but only a computer match
of a sample of the original paint will get a "true match".
The reason is (this comes directly from 2 US paint manufacturers -- Sherwin
Williams and Cortaulds) the pigments are typically mined, prepared and mixed
in regional plants. Thus, the same code mix from 2 different plants will not
exactly match. In fact, even multiple containers from the same plant will
not exactly match. This is because the pigment ingredients can, and do, vary
from one batch to another and sometimes even within a single batch. This is
why when you will be using more than a single unit of paint, it is
recommended that you intermix the several units that you have so that they
will all be more closely uniform.
When a computer match is done of a sample, the computer will measure the
emissivity and absorptivity of the paint sample. When a mix is made from
that developed recipe, the computer can make the small adjustments necessary
to make the new mix closely match the measured sample.
So, even if you "use the mix code" of an original paint color, you will
definitely not get "exactly" the original paint color. The source of the
pigments 40+ years ago is very unlikely to be even remotely the same as it
is today. Not to mention that the various liquids used to suspend the
pigment will not be the same either.
So, just go with a color that you like.
Roy
'60 TR3a (TS63103LO) in restoration
techman@metrolink.net
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