Electrical tape is not really opaque at all. If I want opaque, I use foil tape. Some brands have a slight tendency of pinholes, though, so two layers is indicated.
My plan for next time was to tape a bit of aluminum foil in that spot. And to remind myself that I have to turn the knob farther at the beginning than at the end, but that's something I should've thought of from the beginning.
Okay, point. I should've specified visible light. (I would've been less surprised if I'd been using infrared; I already knew some black plastics transmit that.) Snark acknowledged.
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You merely got the frequency bands it's transparent for wrong....
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Because I want to say it
Re: Because I want to say it
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