What if you spun the injectors and blending block?
....Bill
I know what would happen to me if I tried that.... I'd get burned!!!!
The best way I have found to get a nice swirled bait is to use a split cup. If the divide is cut about 1/2" before the spout area to allow the colors to mix, you can get the desired effect. Your plastic cannot be to warm or the colors will just mix in the mold.
I have used my injectors as mentioned by microspoons and the cooler plastic is a must. The results are more one color then another color for me vs a swirled bait.
Guess it is just a practice thing like everything else.
Jim