That depends on the colorant, really. Either add more Junebug or add some Black, or both.
I don't use Junebug colorant or X2. I use non-X2 Black NB and non-X2 Purple NB, and at a rate of 15 drops Purple to 1 drop of Black, per ounce of plastic. 12 oz.s of plastic get 180 drops Purple and 12 drops Black (1 Tad .040" Moss Green flake, 1 Dash .015" Moss Green flake), that turns out a very fine, rich Junebug.
