Originally Posted by
ps_bond
First off, I'd suggest that salt water etching of silver is a pest - it forms silver chloride, which is insoluble in water so will bung up the etched area. Far better to use something that produces a water-soluble salt, like silver nitrate (but keep it in the dark...).
Without knowing which stop-out varnish you're using it's difficult to be certain, but too much current will generate a lot of heat which can lift a number of varnishes (like the shellac-based ones). The traditional ground is bitumen-based, which is more resilient than shellac (but also a lot messier to use and clean up).
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