What are the colors in 13-13-13 mixs for plants?

How can you tell wat is what in the Nitrogen, Phosphorus, and Potassium or what ever order. The're are three or four colors one is is grayish black the second one is brownish and the third is white but there are some clear ones also. It says that is contains 6.00% of chorine or something like that i cant remember but any way if ya could help that would be nice. I want to make it 15 15 10 or something like that.