Nice! Do your N. mikei pitchers actually mature to black as advertised by vendors? The leaf itself looks colorful.
Oh.. sorry, didn't see you there for a couple days
Here's a pic - they get pretty dark:
With a flash it's pretty dang black, but without, I'd say it's more of a really dark powder purple-grey maybe? It's pretty close to black in the Nepenthes world though imho.