I think that its more of a "culture" thing - England/Australia folks called colors a little different then we do. For example in the Abys our "red" is called "sorral" there.
From what I've been told the Burmese chocolate is really more of a "black" then a true chocolate genetically. In the Ocicats the chocolates came from the chocolate point siamese and the tawnys came from the seal point.
And maybe there are calling sepia and chocolate the same. I think on the Singapuras coat that color is "chocolate" and is called sepia.
Not sure on the high grade silver. Look at Tobie's coat and see how much silver/white there is compared to the chocolate ticking - let me know.
I'm gonna try and find the color genetics from the ocicat to see if it helps or just makes it more confusing to us
I know an ocicat breeder had it on his website and will post the link.
Here's the Ocicat genetics (in part):
First the colors
The Black (B) pattern color was inherited from both the Aby and the Siamese, the Chocolate (b) was inherited from the Siamese and Cinnamon (bl) inherited from the Aby. The silver (I, inhibitor gene, in other words inhibits color) ground color was brought in with the American Shorthair.
From all the breeds we have probably introduced the
modifier gene (d) for dilution turning black to blue,
chocolate to lavender and cinnamon to fawn.
Here is a link for a color chart on Ocicats.
Once you have read anything on genetics you will realize that ALL cats are "tabbies".
An Ocicat is a spotted cat whose pattern follows that of a "classic" pattern. For this reason our standard carries 40 points for pattern alone.
We believe the spotted pattern was inherited from the
Siamese, as many Siamese in the era that produced the first Ocicat showed a spotted pattern on their torsos especially as they aged and darkened. We also now believe that the spots are modifying a pattern. Therefore it in itself is not a separate PATTERN, it just modifies genetically whatever pattern the cat carries. In the early days Ocicats carried both classic and mackerel patterns, both of which could be modified by the spotted gene. We found that working with the mackerel pattern was hard as it produced spots in sort of a tiger pattern causing elongated spots as opposed to the more pleasing rounder thumb print shape spots. Since mackerel is dominant over classic it was easy
enough to eliminate mackerel from the gene pool by not
using mackerel patterned cats to reproduce thus leaving us today with all classic patterned cats.
Because the Ocicat can still be outcrossed to Abys we still need to deal with another coat pattern and that is
TICKED (T). First generation cross to an Aby will produce all offspring with ticked coats. Although the spotted modifier may still be there with a ticked coat it usually only shows as small spotting or as we call it "trout" spotting. Second generation of a spotted bred to a ticked can produce spotted but also ticked AND our none spotted variety.
Since the spotted modifier is dominant we see in litters
the non spotted variety, or we just call them classic. And since the Ocicat is an "agouti" cat and that gene is also dominant we also get non-agouti or solid.
Gone but not forgotten is the Siamese gene (cs), although rare it does show itself. This produces a blue eyed pointed spotted cat which we call "ivories".
The majority of reputable breeders do their homework. We deal with color, pattern and body conformation genes when we work to produce the "perfect" Ocicat. We have to take ALL that in consideration when producing what you see today as the OCICAT.