I recently had a conversation with someone on whether or not to use different spellings to what you are taught in school while writing. I am from Australia and am currently writing a novel that is set in the United States. So I was wondering if i should be using the American spelling for words or the European spelling. Take, for example, Colour vs Color. I wanted to write 'colour' but decided against it since it was set in the US. Any idea on what to do?