If a glass of certain colour is heated, then how can we determine the corresponding colour that it will glow with?
For eg: I saw a question that asked "A blue glass when heated will glow with which colour?" and the answer was stated as "yellow" because "Blue glass appears blue at ordinary temperature as it absorbs all other colours. When it is heated, it emits white radiation deficient of blue colour, i.e., yellow coloured radiation."
How was this obtained? How is white light deficient of blue light yellow? How can we predict the same for a different case?