Hi guys, I want to etch a layer of gold, which has been deposited on a glass surface, with a thickness of about 30nm by using aqua regia. Non-diluted the each rate is too strong so I have to relax it a litte bit. Does anyone have a recommendable receipe for diluted aqua regia? Etch time should be about 15 seconds for the whole 30nm gold layer... Thanks a lot and best regards, Chris