HKS Color Fan Decks with classical 88 Colors

Classic HKS Fan Decks from the German Printing Ink System

The both versions N (for natural =uncoated Paper) and K (for coated Paper) uses different printing chemicals to reach a better visual color matching on both paper types.
This is the difference to the Pantone matching system, they use the same chemicals for both paper types and gets different color shades on both paper types.
HKS is the German printing ink color sampling since 1968.