The Colour Guides series replaces the Colour Aids series. Revised versions are being relaunched as Colour Guides (as this one is), and new titles added. The Guides have added and improved features whilst retaining the colour illustrations, text accompanying facing page and the white coat pocket format. Added and improved features include text expanded and updated to provide more information; typeface condensed to provide more information in a concise format; bolder headings make topics easier to find; new illustrations help with diagnosis; index included.