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Good to see the comparison there. To my eyes I still call it dark grey. black anodised aluminium is a deep black to me though reflective so unsuitable here. I guess you could take before and after images and measure if the black yields any appreciable differences in apparent magnitude, but hard to do under identical conditions. Maybe if you have an unadulterated ota to equal the donor one and image using both in the same session? or maybe a spectroscopy test with a laser pointer and see how absorbant of photon energy it is, or some other better test. at least it being blacker than 2.0 is good.
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