so earlier this year, I discolored my saxophone mouthpiece, by putting it in hot water. (it's not even my mouthpiece, it's the schools). because it's hard plastic, it reacted this way to the hot water. what used to be blackish, is now more light brown. My teacher got really mad at me, and now every time I play it, I think of how mad he got at me. I want to fix it. anyone here know if it's possible to undo this? like putting it in ice cold water or something?