I shot a mold full of the chartreuse for tails. I used about 8 of the 12 for finished tail-color plastics. The other four chartreuse tails I cut right at the start of the thin web at the body and laid them out as flat and straight as possible. Then I cut the spear shaped sections out using a razor blade and straight down pressure. The resulting "spears were then put back in the tail sections of the mold and straightened so the wide end was centered at the body and the point centered towards the tail's end. The spears were about 1/8" short of the end of the finished tail. When the mold was closed, the spears were held flat since they are the finished thickness, they could not move upon the next color injection.
Fatman....I suppose if a person cut a chartreuse bait thru the body following the top and bottom edges of the tail as a guide a true split color could be realized but I am almost certain some venting would have to be done that isn't in the mold as it comes to you. Keeping the body section solid for injecting would be a huge challenge and keeping the front edge of the chartreuse vein held back away from the port would be yet another. The incoming second plastic would have to flow on both sides of the chartreuse body area and still flow into each side of the tail. Lots of challenges to over-come.
I plan to try a core, or vein , color shot today but I am going to imagine things won't turn our good. That tail membrane is pretty thin for doing this. I may be wrong and it works great. This is another bait and mold that has a whole world of possibilities right from the get go.