My questions is WHY? If you want a lure to change from red to yellow in the water the why not just make a yellow one? You aren't using it outside of the water, so why need it to change?
There was a post a while back about a company called hi-tech. They make aluminum molds with a computer. I know nothing about them maybe try to find that thread.
Hehe, good that'd be cool the catch my first wipers on my own fly. I was thinking about using these as a kind of swim bait. Just put on like a mid weight bullet sinker before it on a non-fly fishing pole.
Here's a pike fly that I just finished tying. I haven't put to foam head on yet.
-Orange zonker tail
-Chartreuse bucktail body
-Orange Zonker collar
-Pearl flashabou thrown in
I'll be fishing there a lot since I'll be in the dorms like 5-10 minutes away. So shore fishing the inlet will produce fish. At some point if I don't bring up the aluminum boat, I'll probably try to find a fishing kayak that I can use.