Diffraction grating placed in front of a slit of light from an incandescent bulb gives a rainbow.	Lime is heated to incandescence and a diffraction grating is placed in front of the hot lime. How do the colors shift as the lime cools?
Diffraction grating placed in front of a methane air flame. Compare with experiment at right. Which is hotter?	Diffraction grating placed in front of a methane oxygen flame. Compare with experiment at left. Which is hotter?

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