Madchicken,
If you cross RIRed Roo with a pure black breed, "from what I understand", you should have red sex link babies that are girls. The black babies should be boys. The black has to be a pure black, or pure white, or pure barred--with none of the red or orange genes in their type. This is what I have read, but not tried--so take it with a grain of salt

I hope it works! I have read the the Black Austr roo with a RIRed mom gives you black sex link baby girls as well if you did it the other way around.
My Violet, my BR--my FAVORITE girl that is so smart and rings the bell, and announces egg arrivals---passed away today. It was pretty sad. I believe it was a vent prolapse, I have never seen it before, but it looked as it has been described--she has been laying giant eggs the past few days, then stopped yesterday, starting puffing up and standing about like she was not feeling right, then all this stuff emerged today, an egg that was just ridiculously too big and just all this other not good stuff, she just bled and then died...man it was sad. She went fairly quick, when it happened, I did not even have the time I was trying to gather my thoughts about how to put her down..but I was just so shocked, and she is the last one I imagined would just ..not be there anymore...ugh. All trying to lay those nice eggs for me. What a sweetheart. So, she was like the momma out there, she was my head hen, kept most in line, and protected newcomers from any meanies, I will really miss that girl! The best personality in a chicken I have had so far. She was one I would have kept past laying, as a pet...of course my luck would have her be the one this happened to.
I am feeling better tonight, so I surely don't want anyone feeling bad too--but just sharing the news, because I know a lot of you will remember me talking about her. Dang it. Rest in peace Violet. <3
In other news--I candled my eggs tonight, lockdown should start tomorrow. All three look good, i marked the air cells and decided to set them in position a little early because they are just so tiny, and those eggs look awfully full. A little extra time to make sure they can turn the way they need to. I have had bantams hatch a day early, so this is my plan. Humidity up in the morning. Will see what happens.