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No. A bird who is lavender AND splash will still have the splashing from the double blue gene; a bird who is lavender AND blue will still have darker head & hackles (and saddle on males).
Breeding to black keeps the lavender colour purer; it isn't about limiting the amount of the dilution; it's about keeping the bird's colouring uniform. I have fairly limited knowledge about how genes work at the cellular level, so I cannot tell you WHY blue gives darker heads/hackles/saddle, and why splash gives a splotchy appearance. But I do know that that is what this gene does. Lavender does not change that. I do not believe that a person could reliably tell the difference between a bird who is blue or splash AND lavender without knowing the breeding background.
No. A bird who is lavender AND splash will still have the splashing from the double blue gene; a bird who is lavender AND blue will still have darker head & hackles (and saddle on males).
Breeding to black keeps the lavender colour purer; it isn't about limiting the amount of the dilution; it's about keeping the bird's colouring uniform. I have fairly limited knowledge about how genes work at the cellular level, so I cannot tell you WHY blue gives darker heads/hackles/saddle, and why splash gives a splotchy appearance. But I do know that that is what this gene does. Lavender does not change that. I do not believe that a person could reliably tell the difference between a bird who is blue or splash AND lavender without knowing the breeding background.