Introducing an essential addition to every artistââ¬â¢s colour palette ââ¬â four opaque neutral grey inks! For the black & grey artist looking to create a smooth opaque gradation, these four inks are evenly spaced at 20%, 40%, 60% and 80% of black on the value scale. Colour artists will love the neutral greys for toning down any colour without having a shift in colour hue. Adding these inks allows an artist to extend their colour palette with a wider range of tones and shades.