MF has one and so does Spike It. I have them both and prefer Spike It's. To get a decent amber under tone with MF's you need to add quite a bit to it and when you do that the green over tone washes out the bait completely. Spike its on the other hand gives you a rich amber undertone and a more subdued green over tone. If you have seen production baits that are the changeable motor oil (amber/green) then there is a very high probability that it is Spike It's (their parent company is a very large supplier in the soft bait industry)