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Andalusian Blue is regular blue. Blue with lacing. It does not breed true, meaning if you cross two Blue birds the result will be 50% Blue offspring, 25% Black offspring and 25% Splash offspring.
It looks like this, one of my Blue English Orp hens, Alice.
Lavender, or Self Blue is a recessive gene that requires two copies of the gene to be expressed, one from each parent. If two Lavender birds are mated they will breed true, producing only Lavender chicks.
Lavender looks like these, this picture of a Lavender Orp via chirpychicks.com.
So Coronation with the Blue gene looks like this,
Pictures of the adult birds can be seen here,
https://www.backyardchickens.com/forum/viewtopic.php?id=519249
I have a picture of a mature Blue roo, but it's not mine. I can ask the owner who I hatched these chicks from if I can post it here.
With Lavender, Coronation looks like this. (These pictures were taken from a Google search...)
One of the major advantages the Blue Coros have over the Lavender birds is that they do not have the genetic feather issues that the Lavender birds do. If you look at the Lav Orp pictured and the second Lav Coro hen pictured you'll see that some of the Lavender colored feathers look frayed, sorta like they have split ends. This is called "fretting" and is common in birds that express the Lavender gene. For what ever reason Lav birds tend to have a poor feather quality that causes the fretting and damaged feather look, breeders combat this issue by crossing their birds back to Black birds and then breed the Splits together or back to Lavender birds to improve feather quality. It's not an issue you have to deal with in Blue birds though.
Personally, I think the Blue birds are much prettier and don't have that faded, "washed out" look that many Lavender birds have. Lavender doesn't look like Lavender to me, it looks like dish water gray.
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