Mayur,
The compar. value in the screenshot needs to be the product number you are comparing with. Now this is where you have to understand that you will need to create a single decision step for each product if each product needs to have a unique color and I anticipate that the option of colors will be exhausted pretty soon with this method. If you can group the products which use the same color by any free attributes in location-product master, you might have a chance.
Regards
AK