Color formula in Excel

[uncolamn]

Want to have dark green for positive number and red for negative number. Got the red done but putting green makes it like a lime which can't be read. Looking to put dark green but when I put dark green it won't accept it

 

[ex_bubblehead]

This page (http/dmcritchie.mvps.org/excel/colors.htm) should help.

And, it's better to use either black or white for text and change the background color (much more visible)