Specifying colour accurately for corporations is an ancient art. A Renaissance patron might have produced documents similar to those produced by design teams today.

Organic lakes or tones shall not be used to fortify or sophisticate inorganic pigments. Substitution of similarly coloured pigments is not permitted.

A companies' corporate "sky blue" might need to be accurately specified for paint used on a Formula One racing car, coloured thread on a baseball cap, flat artwork for a television advert in Sydney, paint for a hand-painted advertising hoarding in New Delhi, ink colour for a trade ad in a Wisconsin newspaper printed on newsprint and a web site hosted in Tuscon viewed on hundreds of different type computers screens worldwide.