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Comment by marcodiego | Hacker News Reader

So dark it makes difficult to note relief. Maybe it is a good choice to paint telescope tubes' interior.

If you're interested, here's a thread of telescope nerds discussing that exact usage: https://www.cloudynights.com/topic/692954-how-black-is-the-b...

  Well... the price was reasonable, something around $26 for
  150 ml bottle including shipping to Pennsylvania (USA), and
  I am not Anish Kapoor so I decided to give the paint a try.

Since many of us are amused by the Anish Kapoor situation, I wanted to highlight this wry comment from your link.

That's the whole idea.

It wouldn't be much of an absorber of all visible radiation which hits it, if it bounced enough back to make out textural details.

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