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Originally Posted by sheeny
So what you really want on the inside of your OTA is: - a matt black paint (to minimise optical reflections)
- that is conductive (to minimise thermal insulating effects - I'm not sure how important this is!)
- that is "white" in the infra-red part of the spectrum (to minimise radiation losses)
I have no idea if such a beast exists!  ...but I've enjoyed the mental exercise of working through the problem! 
Al. |
Al, on the inside of the tube there are no radiative losses, as there is nowhere for radiation to go except back into a different part of the tube, so no nett loss.
So perhaps the third item in your list is not so important? Not sure.
Bird