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This is how it was explained to me .... The color, "blue," in the animal world is a grey shade, such as a blue heeler dog (it is grey). Grey chickens are called, "blue." Lavender is also called, "self blue," as another term. The easiest way to tell the difference in blue and lavender is by looking at the feather shaft .... blue has a dark shaft, and lavender has a light or white shaft.
Now, I am not 100% on this information, but this is how I understand it.
Another thing is .... you can't, "make," lavender from a blue or other. It is a gene, and has to originate from a bird with the lavender gene.