Inglot has a super deep dark black gel liner. I haven't tried it myself, so I don't know how it performs, but it's very intense black. I've heard it's quite dry though, but again, I don't know it personally. I use Mac Blacktrack fluidline, it's very black too. The Urban Decay Ink For Eyes in Zero is quite black also. The blackest pencils I know are Urban Decay Perversion and Mac Feline.