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Someone else once suggested using rubber cement on the areas you
don't want patina'd. Other types of resist that will work are paint
pens, acrylic paint, beeswax (melted), crayon (melted), and more.
Yeah, liquid paper will work too. Really, anything that you can find
at hand that can be applied with a brush and removed with hot water
or a minimum of effort will work. "Resist" is just the word used to
describe the action in which two materials or media repeal each other
either chemically or physically. Anything that will act as a barrier
between the silver and the LOS will work.