Hi Sam,
The liver of sulphur solution won't affect the shellaced or
varnished
areas. I had assumed you were going to oxidise some new
brass
parts to match existing ones.Normally, I'd remove the old
finish
via lacquer thinner and/or heat ,clean the metal in an acid
bath,
then dunk into the oxidant. Then clean well in water, if you
want
to lighten the new finish a bit,rub with fine steel wool,
clear auto
lacquer in a spray can is a pretty good finish.
Again, Good luck,
John Billingham
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