Marl

Marl is a random, non-hereditary mutation that may occur in any breeding. Marl is a complex marking that creates extensive, distinct spotting across the coat and masks many white markings, including Appaloosa, Natural White, Rabicano, Sabino, Splash, Tobiano, Tsasan, Marble, and Vitiligo. 

Marl may cover up to 80 % of the body and appear anywhere. This spotting appears in three layers - large, dark, grease like smudges, followed by a heavily spotted, Sabino or Tobiano-like white, then another layer of slightly lighter grease smudges. The smudges often appear as tapered spots, likened to the dark spots of a seal pelt or that of a merle dog. These smudges may have a slight colour gradient, but will always be a darker shade of the base coat.

The white of Marl was originally thought to be linked to Leopard Appaloosa, due to it's extremely spotty nature, but this marking tends to have very little predictability in coverage and location on the horse, it's only characteristic being it's spotted appearance. It may have Leopard Appaloosa, Tobiano, and Sabino tendencies.

When combined with paradox, the white spotting will turn black as usual, but oddly the dark grease like smudges will turn lighter than the coat.