The fact is that a bird like this has a "Recessive" dilute gene. This means that a bird could really be a blue bar. However where the blue is been 'diluted' with this recessive gene, we call that color in the English Tippler World a "silver" (although your description of the color being "fawn"-like is also a nice description of this same color. If the bird without the dilute gene would have been black, then the diluted bird is called a "Dun".
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What colour is my hen
The fact is that a bird like this has a "Recessive" dilute gene. This means that a bird could really be a blue bar. However where the blue is been 'diluted' with this recessive gene, we call that color in the English Tippler World a "silver" (although your description of the color being "fawn"-like is also a nice description of this same color. If the bird without the dilute gene would have been black, then the diluted bird is called a "Dun".
I hope that helps.