Since Pantone© took it upon themselves to re-sort all the formula guide colours into what they consider the simpler colour order, rather than the traditional number order, it has become a little time consuming and frustrating when attempting to look up specific colours; which is why I suspect they have developed this little search tool on their website, which tells you which on page the colour is located in the formula guide...
Reference: http://www.pantone.com/pages/pantone/colorfinder.aspx
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