A warning to orchidians using the chemicle method of Potassium
Firstly this must be done in a fume cabinet as the fumes are toxic,
second the best colouring is achieved when the article is secured on
copper wire and suspended in the froth of the boiling liquid
mixture, removing every 30 seconds and washing until the correct fine
gold colour is achieved, another tip is if you require two different
colours of gold, say a pale yellow coloured 18ct against the fine
gold background, the section that you want to leave pale yellow can
be masked out with powdered plaster mixed with a standard fish glue,
this will set hard and mask out the area needed to be left pale
yellow, and when the colouring is completed the masking will soak off
if left for a while in water, this is a method I used in the past
making 18ct gold English Field Marshal’s Batons.
James Miller FIPG.