Need help sexing/identifying 10 week old chicks

[Southstar]

I’ve got 2 10 week old chicks and I was wondering if someone can provide clarity on breed and sex.
Buttercup, my yellow one, was sold as a Buff Orpington. Color seems a bit dark though.
Sweetpea, my black one, was bought from a local feed store and they said they didn’t know which of their chickens had bred, because they’ve got a mixed flock. I suspect Black Australorp, but I don’t know for sure. Wondering if she is a hen or roo. She decided to nestle into my collarbone for the ride home, hence her name.
Either way, I’m keeping both. They’re lovely chickens.

 

[Bigtom Turkey]

The black is most likely a BA, and the other is BLRW. And both are hens.

 

[Frazzemrat1]

The one is a blue laced red wyandotte...
the black one: What color are the foot bottoms? Yellow would be a black jersey giant. Pinkish would be a black australorp.

 

[Southstar]

The one is a blue laced red wyandotte...
the black one: What color are the foot bottoms? Yellow would be a black jersey giant. Pinkish would be a black australorp.

Probably Australorp then

 

[Southstar]

Also, when and how should I introduce them into the coop with my other 3 hens?

 

[Rhodebar Lover]

Australorp and White Laced Red Cornish (comb, body type, and feather hardness is off for a Wyandotte)

 

[Frazzemrat1]

Also, when and how should I introduce them into the coop with my other 3 hens?

Have they been introduce yet? Usually I house my youngsters along a shared fence line as the adults for about a month, then just let them go. They usually behave as if they're the same flock after that.

 

[Southstar]

They were introduced to the big hens through the wire, but not in the coop with them. Today they were out with the hens and only 1 of my 3 tried to go after the chicks. The attempts were thwarted and she eventually wandered off.