I remember once dealing with a posh client at the lab I used to work for. He told me exactly what he wanted, just as he had been told by the photographer who had taken the shots of him. I had to admit I did not know what a CPA process was and suggested if he wanted a brown tone I should use some Thio. He spelt it out to remind me how stupid I was. C! P! A! No, he didn't know what it stood for but that was what he wanted. Then it clicked as I once again translated his plummy tones. 'Oh you mean Sepia?' I asked.