The amount of discoloration has a lot to do with what's on surface when heated up (like oils from handling, remnants of cleaning solution, elements deposited from the flame, etc.). When brass is really clean, it's hard to get the brass to turn a color when just heated, like with induction. For the picture I posted, the blue look is being mostly a reflection from the blue box they lay in .Those are pretty! Some clowns told me that a blue indication on the brass meant it was over annealed. LOL