Double click to change cell colour

Hi,

The code I wrote below works fine, I have also defined some cells as "ColourRange" in the same worksheet, so how do I make the code only works for ColourRange's cell rather then entire worksheet?

Thank you in advance.

Ed

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Thank you Debraj Roy, it works great, much appreciated. However, if possible this double click/right click feature only works ColourRange's cell so user still able to edit other cells by double click mouse instead of using F2?