Standards for pair colours?

All,

Anyone with access to the standards know if there are actual
recommendations for colours of the pairs in 'CAT 5' type cables?
I don't mean sheath colours, but the actual shades of blue, orange,
green and brown.
I know they vary a lot from manufacturer to manufacturer, but wondered
if there were actually 'RAL' or Pantone values given anywhere?

TIA,
Phil Partridge
philp@xxxxxxxxxxxxxxxxxxxxxx
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