I've added lighter colors of Americolor gel directly to the batter (yellow, green, pink). For brown or black, I start with a chocolate cookie recipe. Not sure if the brown gel color will make the cookie dough dark enough. You could try rolling the dough out in cocoa powder but I don't think I would add any to the recipe or add any additional liquid--it might throw off the chemistry of the dough.
HTH
Kristy
The best thing to use is the wilton coloring gel and it wont make your dough runny. You can buy at walmart
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