My experiment would be something like:
1. buy different fabrics or cellophane or paper of shades of black to white
2. cover it around a glass or jar or a wine glass or something like that
3. put the same amount of water in each glass
4. turn on a light for 30 mins, allowing it to heat up
5. use a thermometer to see how hot each one of them are
and then voila you'll see which one will be the hottest. I'd have to make sure that they all have the same amount of water, with the same container thing and the same light thing. I'm also looking up the EM spectrum, visible light and absorption of light to get some background information.
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