Thanks langleybaston. Pedantically – if there is such a word – Black and White are not true colours. Black absorbs all colours and white is all colours combined, which could open up a whole new conversation about RGB for visible light and RYB for paint mixing. pr00ne, I am completely unfussed about saying b/w stands for Black and White but I thought 50 shades of grey would be more humorous. However, if you have to explain it…….