"The colors of the visible spectrum are: Red, Orange, Yellow, Green, Blue, Indigo, Violet, always appearing in this order. An easy way to remember this is by remembering ROY G. BIV - his name spells out their initials."

This paragraph from the text suggests using the "initial letter" memory strategy to help remember the names and order of seven colors. This is one of six memory strategies, (for which an initial letter strategy "OILRIP" can also be used):

1. O    organize
2. I     imagery
3. L    loci method
4. R    rhyming
5. I     initial letter
6. P    pegword

More information on memory strategies can be found at: http://www.demon.co.uk/mindtool/memory.html