Most artists will have some relationship with colour, wether it be ink, paint, pencil or paper.  The colours you choose are important for many reasons, for their colour for one, but also for their longevity, their intensity, their opacity, their sheen, their ability to work on top or underneath other colours - I'm really only scratching the surface of the subject. Today's guest lives and breaths colour, he is managing director of Cranfield Colour who make printing inks for intaglio and relief printers including the very popular Caligo range of 'safe-wash' inks which are oil-based but can be washed up with water and a little soap!  Cranfield Colour also make oil-paints for the professional market.  Michael talks to Laura and Peter about some of the science, and why choosing your materials well is so important.