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Greyswandir t1_jcqy9z6 wrote

Reply to comment by GulliblePlantain6572 in What decides which wavelength to reflect and which one to be absorbed in an object? by TheSimpleHumans

Basically is it backlit or lit from the front. If you backlight the cup you are looking at the light that has passed from the light source through the cup and then reaches your eyes. If you put the light on the same side of the cup as you, then you are looking at light which hits the cup, reflects or scatters off the glass and gold and then reaches your eyes.

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