I like this joke a lot :-D. But technically, all objects above absolute zero radiate infrared, right?
I imagine if something gets cold enough its black body spectrum will have very little infrared in it, with the peak dropping down into the frequencies below infrared. There will still be infrared emission, but I'm not sure if the swatch could be termed to be colored infrared at that point. Maybe it would be colored microwave.
considering that no one can "see" infrared, it seems wierd to say that it is colored as such. if the combination of colors creates other colors, then the square can't be "colored" infrared because it would then be a combination. if you say that it just emits or reflects infrared, then the color is still meaningless, because any visible color could do that if it contains IR reflective qualities. and, black would both emit and absorb IR since it absorbs, and it gets hot.
Who wrote that about sunburn? are you sure? "Although relatively harmless, overexposure to IR can cause damage to cells and is the cause of sunburn? (despite ultraviolet commonly being thought of as the culprit.)"
Scientific American seems to diagree: http://www.sciam.com/askexpert/medicine/medicine57/ --rmhermen
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