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Colours & the rainbow...
"Red and Yellow and Pink and Green;
Orange and Purple and Blue,
I can sing a rainbow..."

Except that Pink is not a colour of the rainbow.  List 1 below lists the colours of the rainbow, as you would find them in most school texts.

Red
Orange
Yellow
Green
Blue
Indigo
Violet

Table 1 - Colours of the Rainbow.

Personally, I always felt that when Newton described the colours of the spectrum, he was pushing a bit to make it be 'lucky' seven - I've never been sure that I can distinguish Indigo from Violet in the rainbow or in a spectrum from a prism.

Some common mnemonics for the colours of the rainbow:
  • Richard Of York Gained Battles In Vain
  • Ran Out Yesterday, Got Blotto In Vineyard

Table 2 - Rainbow mnemonics

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