Union Jack Black is a simple jet black color with an extremely smooth consistency. It took me 2 coats to get the polish to be opaque, but that isn't to bad considering the fact that both coats were pretty thin.
Knackered is a very unique polish in the fact that it is a pale lavender green duochrome with flecks of glitter and is unlike any other polish I have run into. It is a very sheer polish, but can be layered to become opaque. Personally I am glad it is sheer because when I layered it on top of the black, it really made my nails look as though a galaxy was printed on them!
Hannah xoxo