I'm neutral towards chocolate-colored birds, however your platinum/dun is a stunning combination. Poe is gorgeous.

Dun is also referred to as Chocolate. It can look like this.
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This is not my bird, just an example I'm using.
Dun behaves similarly to the Blue gene. It dilutes Black to a brown hue. 1 "copy" of the gene produces Dun birds, 2 "copies" of the gene produces Khaki birds. Like with Blue, 1 "copy" produces Blue birds and 2 "copies" of the Blue gene produces Splash birds.
Like Blue, Dun can come in many different shades.
I refer to the color by it's genetic name rather than using the term "Chocolate" to not confuse Dun with the sex linked Chocolate color.