Black Honey is a dulled brown plum. I don't believe there is such a thing as a universally flattering colour and I wouldn't recommend this for anyone with very light or clear colouring, but for more muted/dark colouring it is a very good natural lip colour. I prefer Dior Addict 783 Londres for a natural lip look on myself (it's more mauve, less brown) but Black Honey is a more subtle finish.
Swatch on white paper:
On my lips - it deepens the natural colour of my lip but without adding brightness.
£16.50, from almost every department store.