changing colors of text when data is changed

[ElbertTilghman]

I want to pre-populate a work sheet with numbers and then if the number is changed it will change the color of the text or the cell to let me know it has changed

 

[Joe4]

Welcome to the Board!

It is just specific cells/columns that you want to change color, or the whole sheet?
What color would you would to change it to?