Etching for silver-
Use Etching with distilled water 150g to 200ml. Use Pyrex dish and plastic spatula or wooden spoon. Still wear protective clothing and gloves. No emmissions are inherant but still undertake all preparation in a well ventilated area. The most important thing to remember when mixing the solution is to always add patina to the water and not the other way around.
( option also available for brass and copper – see C0135)