Light travels in waves, the longer the wavelength, the less frequency it has, which means the weaker it is. A light wave can be either reflected, absorbed or transmitted. An object that's black has all of its colour absorbed that no light can be reflected, which then makes black the hottest. An object which is white has a mixture of different colours
In the experiment, the darker colours will absorb the light, the lighter ones will reflect, but all of them will have light transmitted through them, especially the ones with cellophane.
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