Chai Tea wrote:oh, I was thinking it had to be the same object.
All I was coming up with was chessman, thinking there was some subliminal connection.
still thinking...
I think it is the same answer.
Metal, or iron, or what have you.
It goes into the water red when it's heated and comes out black once it's cool. It also can go into the water black, and comes out red (rusted).