Andrew Lamberson slipped a comment in another thread regarding E-core's play time with the Valentine's Day cores he came along with. I sort of picked it up from there. Color shifting pigments are hoot to work with as long as one understands that the absolutely do their best when used over a black base color.

I shot the 4 ounces of clear plastic with an average amount of "Delta" color shift pigment added to it, nothing else at all, just the blue to purple color shift pigment which is a white particle product and basically disappears in the plastic until light hits it. The clear baits at the top of the runner show little of the pigment's presence except for some very faint blue casting in it an a couple near the runner and were left in the mold as a reference to how the color shift needs the black. The pins were pulled from the baits on the other side of the runner, the tails clipped off to open the "core" fully, then re-injected with a plain black plastic.
There was an issue on a couple of these small bodies that went back in with the black shooting in under the bodies as well as thru them so you'll have to pardon that. And the bait with the eyes has some cold air bubbles in the cover coat which needs to be over-looked. The focus here is the way the color shift works wherever there is black underneath it, as in the core. Where the color shift is in gear you'll be able to see both the blue [primarily] and the purple coming out of the blue in a couple areas. Not being able to be seen in a still photo, as the baits are turned the blue follows the light so from any angle there will be a line of color. I know from having fished baits using the color shifting pigments that in the water the colors are just flat out electric, stunningly beautiful colors. In the case of this bait, the lateral line will appear to be either a blue or a purple line of color and eyes help to orient fish to the line....gives it some realism.
I'll post a picture a bit later showing the mold and the pin orientation for those that may want to play with a similar sort of injection technique. Fair warming though....the Nano is SMALL and you can expect some of the little glitches like I had if trying an e-core, however the baits you'll get are very much worth the time and fuss especially on a small jig in front of big sunfish or crappies.