Chin colors explained breeding Black to White
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There are 2 kinds of "black" and for that matter, MANY variations on "white"
Black Velvet is the most common of  the dominate color mutations. Most often "black" refers to black velvet.
Ebony is another black mutation, though not as common as BV,
is a solid blackening and considered recessive (weakly dominate)
White maybe in the pure form (Wilson White), Mosaic, Pink White,
Silver and more.   The"more" involves the fact that the white gene can be compounded onto normal (standard) gray, the Velvet gene or the beige gene. 
When BV is crossed with another color the white chins that also carry the TOV gene will have the "
wrist stripes"
White X Standard gray = 50% gray, 50% white 
There are three recessive genes.  Two of these in chins are VIOLET & SAPPHIRE. This means the gene must be present in both parents genetics for the young to show it in the homozygous form.   If a parent is a violet and their mate is std gray but CARRIES violet, then 50% will carry violet behind the gray and 50% will be Violet. If a std gray, non violet carrier, is breed to violet then all babies will be gray vio carriers.  Breed 2 gray violet carriers (vc), 25% of the young will be violet, 25% pure gray and 50% are gray vc...It is not really possible to be sure which grays are which unless you breed them to a violet.  This is also true when using Sapphire instead of Violet.   Then along comes EBONY....
~ STARDARD GRAY ~   BEIGE   ~  BLACK VELVET ~   WHITE ~
Ebony is black- solid black (no white belly) but this can vary a lot from a pitch black to a charcoal with lighter undercoar. The best  genetic description that I have heard is "weakly dominate recessive".  Ebony can be compounded on it self to produce the rich black shiney coat.  But as in "carrier" form, the weakest expression is a gray wrap or charcoal.  This phase omits the white belly of the standard gray to create a solid gray coat or "wraps" the color around the body.  The debate as to whether it truly exist in hetro and homo phases is rather interesting... see more here.
Ebony can also pair with the ID colors easily then either violet or sapphire.
~ VIOLET      ~     SAPPHIRE      ~     EBONY ~
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A word on Chin Types
Iowa Small  Pet Show 2002