title: Colour palette that works in colour and in greyscale?
body: <p>I was just wondering if there is any colour palette in ggplot that works both in colour and in greyscale?</p>
  <p>The background is that I want to submit a paper and the journal displays the online version in colour but the printed version will be black and white.</p>
  <p>The colours are quite important in some of my figures, so I was wondering if there is some easy way to keep most of the information in the printed version.</p>
  <p>Many thanks.</p>