heat absorbtion-gloss black or flat black-which is better?
It is scientifically proven that matte black is the most heat conductive.
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What really absorbs "best" is whatever color most efficiently converts the wavelength into mechanical motion at the molecular and atomic level. for broad spectrum absorption, flat black in general, although paint chemistry, coating thickness, and the makeup of the underlying substrate all affect wavelength absorption (and retention).
Flat black. The glossier the finish, the more it reflects.
Remember, however, that flat black also _radiates_ heat most efficiently. The outsides of cooking pots are traditionally polished because that reduces heat loss, and yields a net gain in efficiency even though it gives up some absorption. Lemonie's pointer to "black bodies" is a good one; that will get you closer to the Whole Truth. (Many years ago, a professor very kindly and patiently explained this symmetry to me, after I thought I'd discovered a way to make heating systems more efficient. I should have realized that if it was that simple someone would have beaten me to it, but... Oh well, it was a fun design exercise while it lasted.)
Matt black (flat), but it is wavelength dependent. If you want to choose paint for a heat-absorbing device go for matt/flat. If you're really interested: black bodies L
flat cause it has less of a mirror effect as to a gloss which is made to reflect light to make it look better.
Without a doubt, Flat Black. The less reflective surface will absorb more heat,
Flat. Though appearances can be deceiving. Steve