I've had a wad of mixed variation, Pumpin Seed colored plastics for awhile...some had very small Black flake, some had Medium and Large Black flake, some had plastic Flash Foil...I chopped all of 'em up like a Salad and nuked 'em. When I 1st got geared up to do this Plastic Thing, I remelted the entire pile of 'em. It made a nice, natural, light Brown/Pumpkin color that I call Bull Booger.
Maybe a few months ago I pulled the Ball of Bull Booger out the box. I wanted a color, something like Coffee...strong Coffee. I added some CCM Brown and it started looking good but was a little "deeper", a little more transparent than I was looking for. I added CCM White a few drops at a time to give some Opaqueness...Creamer!...perfect. I threw in some .062" Black flake for good measure and went to work with my Very Fine CCM Injector.
If I wanted a Chocolate, I'd take this same mix and add Black a little at a time to darken it. I may fail doing it, but that would be my 1st choice if I had a Sweet Tooth.