Using the above material "Avian Black" as a starting point for a quick search through the MSDS for this "MIL-DTL-64159 TY-II Black 383 CARC" product, I have found one that lists the pigment as 6% Carbon Black (by weight) in a urethane coating.

So for a home brew version it would look to be your choice of clear base "paint" and add by weight 6% Carbon Black. That's a lot of carbon black.