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Read some american website a couple of weeks ago, don't ask where, were they did some tests on them portable observatories with dome.
Wife wanted to have the outside colour matching the surrounding garden, Green. Bloke installed fans, vents etc. without much success. It was still very hot inside. Some paint tech bloke told him to paint the inside black-black and it worked, much cooler inside now. Has something to do with solar rays not penetrating the INTERIOR black paint, whereas when it is used on the OUTSIDE the interior becomes an oven.
Can't think of the website, something Dome, follow the links to the tests.
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