This looks like a lavender chick🤔

[Snugglesandwigglespetcare]

(Excluding the complication of colors that cover up other colors)

Your splash birds should always produce blue offspring, unless they're paired with another blue or splash bird. And your splash chickens will never produce black offspring.

However, if you're getting blue chicks from parents that aren't splash, then one parent has to be blue.
That could mean the blue is so dark it doesn't look blue, or other colors are covering up the blue.

Black x blue = black, and blue
Black x splash = blue
Blue x blue = blue, black, and splash
Blue x splash = blue, and splash
Splash x splash = splash (the color can become faint in this pairing)

Would be easier if colors were consistent and couldn't be mistaken for each other. But where's the fun in that, right?

I have this chart and it has been so helpful. The BCM and partridge pair have always produced black chicks. This chick is the only one to look like this. I am including the two egg color options. As a side, all chicks from the BCM and splash OE hen have been blue.

You can see that the F1OE (partridge hen) front right, eggs are clearly a different color and shape than the BC1OE(splash hen)front left. Plus the eggs on the right of the carton are from both hens. Egg colors have stayed consistent through my three months of breeding in enclosed breeding pens.

 

[Not-so Slick Chicken]

Interesting
It'll be fun to see how they turn out in a few weeks or months
Maybe you do have some recessive genes that just haven't hit the odds yet?

 

[Slothinc]

If I wanted to know for sure - I would either test one of the parents for the lavender gene (it’s $20 at The Silkie Lab), or I would put your EE in the pen with the lav orpingtons. If she carries lavender, 1/2 of her offspring with a lav roo will be lavender. You could figure it out pretty quickly!

Lavender does exist in ameraucanas and marans (though a lot more rare in marans I believe), so maybe it is possible that both of them had a lavender parent, or at least a parent carrying lavender. It seems very unlikely, but hey, you never know until you do some testing!

Early this year, I hatched some chicks with a lavender ameraucana bantam father and a silkie mother (from a breeder, they were shipped eggs.) To my shock, and the breeders shock, 3 chicks hatched out and looked lavender. I didn’t believe it. I asked on a lavender silkie fb group and they said nope, it cant be. Because it is very rare to have a silkie carrying lavender and not know about it. Also posted on the forum and common consensus was that the chicks were very light blue. But I had one of the babies tested and it carried 2 copies of lavender, so indeed they are lavender! It was a very fun surprise.

 

[Snugglesandwigglespetcare]

Do the two hens lay eggs that are the same shape or are they different? Because the egg colors are similar enough that I think it could have come from the splash hen, like @Not-so Slick Chicken mentioned, sometimes the brown coating has a slight manfunction.

I also find it interesting that the chick looks to have dark feathering on the back of the neck. If lavender, would the color be more uniform? I am really eager to see how this chick feathers out! Be sure to post pics when the feather start coming in!

I added eggs at the end of the thread to show a better comparison of the eggs. Chicks from BCM and partridge hen have always been black and all 5/6 chicks in this hatch have been black. Conversely, all chicks from the splash hen with the BCM rooster in this hatch have been blue. Things that make you go hmmmm.