I need help. 
Is there a color chart that I can use . I am trying to get just basic colors dark brown and christmas red and am getting light brown and deep pink. I am using christmas red and dark brown colors. I am trying to color white pastillage. Do I need to mix other colors with them or what??Cheffie 
especially red is hard to achieve. Do you have some ruby, it might help. You need to let the paste sit, the colours will darken over time. I usually colour my fondant etc. at least a day before I use them.
Have you checked out this article here?
Maybe you can add a little black to the brown to get it a dark brown, or use cocoa powder.
http://www.cakecentral.com/article2-How-To-Color-Your-Icing.html
Are you coloring the pastillage BEFORE it dries hard? Then I would suggest using PLENTY of color. The deeper the colors, the more you will have to use, just like in your icings.
Also, whenever i try to make a brown or black, I start with chocolate. I don't know what recipe you're using, but can you add cocoa powder to your pastillage mixture before it dries? If not, try dusting with cocoa powder after you add the coloring. Of course, it will all depend on what you have on hand, etc.
Best of Luck!
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