last minute question!

[y_ctrl.livejournal.com]

hi fellow craft gals!
i'm making soaps today, and i didn't manage to mix a chocolate (hence, dark) brown with the colors i have (red/green/blue/yellow) without wasting A LOT of color.
is there any other way i might achieve this?
would it be possible to mix cocoa powder in the melted glycerine or would it just not come out right at all?

i'd really appreciate any suggestions/ideas!
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thanks and happy holidays!
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