They are excellent layers, even through the winter. I've never had a rooster Andalusian so I can't comment on their temperament. It's a VERY flighty breed though, so I hope you don't plan on trying to confine them.
Andalusians don't come in pure white. When the Splash chicks are little they look all yellow but start getting specks after about 4-5 weeks. They get more "splashy" as they get older, some more than others.
I can share my own thread here to help you out with some pictures. The colors of Andalusians are; Black, Blue and Splash, no solid white
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https://www.backyardchickens.com/t/1047549/the-andalusian-picture-thread
I can share my limited experience with Andalusians. We got 3 in September at a day old, one Splash and two Blue. They are now 25 weeks old. I get two to three eggs EVERY DAY from them which really surprised me...I didn't expect them to lay so well from what I have read. The eggs are medium...
Can anyone tell me when Andalusians "usually" begin to lay? I was pleasantly surprised that my 21 week old started laying! Her comb isn't even exceptionally large or red yet! It took forever for their combs to develope compared to the rest of my flock. I have two blues and a splash. Here is a...