(Pantone Matching System) – PMS colours are standardized colours listed in the Pantone Colour Matching System. Each Pantone colour has a specific code which different printers and manufacturers can refer to in order to ensure colour consistency. If you have ordered full colour printing but you have upload files that contain Pantone (PMS) Colours, these PMS colour will automatically be converted to CMYK. For this reason, artwork should always be supplied using CMYK colour mode.