Robin wrote:

Andy Burns wrote:

vantablack? if so, it's not that new ...

that's what the makers of the stuff say was used...

Apparently a cheapo version of it, 1% reflectance rather than 0.2% for
the "space hardware" version

https://www.surreynanosystems.com/super-black-coatings

https://edition.cnn.com/2017/11/15/world/vantablack-blackest-black-material/index.html