Vantablack at the Science Museum
Pretty disappointing in real life — it looks much more interesting in the photo than it did in the museum. The masks are fairly small, and in a huge glass case in a badly-lit area, so you can’t get close to them or see them properly.
The display card reads: “These bronze masks of presenter Marty Jopson were commissioned by the BBC for The One Show (3 February 2016). One is coated with a paint form of Vantablack, the world’s blackest material. It looks flat because the carbon nanotube coating absorbs more than 99.8% of visible light.”