I'm pretty sure the dark color is just straight black kip
I do have the original bait someone gave me. If you hold the darker color up to a light, you can definitely see red in it.
CCM JR has a really good black and red bait he makes. It's not a ruby, more of a dark red. I'm sure if you asked he would share it.
The bait is not for me, it's for a coworker. But, it can't hurt to ask.