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I am bad at genetics, so lets see if I understand this: Lavender x Buff breeding can create the Isabel color?
Isabel IS lavender diluted buff. However, lavender is a recessive gene, so the first generation will create carriers of lavender, but the birds will not be isabel--their appearance will be buff, and there would be no way to tell that they carry lavender except for breeding records--they will look just like any other buff. If you cross those carriers back to a lavender or breed them together you will have a percentage of isabels: 50% when crossed to lavender, 25% when bred together. You also have to be concerned about the genetics of buff, which might be a reason to cross them together rather than to a lavender, who might produce birds with a lot more lavender in their appearance (of course, that may be what you are wanting--at this point that is pretty much what the porcelain silkies are).