I'm with Alsworms. Depends on the mold. If it's a worm or senko, maybe a grub, something where the bait isn't oriented on its side in the mold, you can hand pour the body one color, close the mold and inject your second color. This makes a nice laminated bait and you only need a single injector. If you use your imagination, you can get more than two colors this way. I have seen both halves hand poured, mold closed, then inject the middle. That's injecting 401!