Ticking genes only affect white caused by white spotting genes listed on the White Spotting page. It "cancels out" the white in various ways, allowing the creature's original colors to show. If there are no white spotting genes present to affect, Ticking Series genes won't be visible, but can be carried and passed on to offspring.
These genes are all part of the same series, so a creature can only have two at most. Ticking genes are codominant, meaning having more than one will show the effects of both.
White markings develop a mottled look as flecks of color reappear throughout the white. May be a few scattered speckles or so thick the white only looks like whisps scattered around.
Will not cause huge gaps of color, though heavier ticking may appear to remove some larger areas of white
(the large gaps in example images here are naturally caused by white spotting genes, not by ticking)