ArtMetal

Roy,
This is what I believe happened. You observed the eutectic principle happen. Aluminum may be an all the rules breaker. It's been along time since I played with those alloys. The mixture of both melted metals fused to form an alloy, the alloy has a melting point between the temps of it's components..color change is one of the reasons metals are alloyed. For fun check out a purple gold alloy aluminum and gold..Wow color but not a workable material as I remember. People that do mokome will frequently do some of their own alloying check them out. There was a good article on alloying in lapidary journal a few years back. Worth looking for. Fun in the metals shop. Brad