I use blue because i always have. I buy blue without thinking about it but i do have one or two black pens somewhere for those forms that have to be done in black. I like the idea of purple though. Perhaps I will buy some purple biros now I have started to think about what colour would really make me happy.
Blue. I like a nice royal blue. Like Sharmila, I would use red if I could. LOL. I have far too many pens and they are in all kinds of colours. I am now inspired to use purple for a while. Thanks girls! :-))