Color Genetics Questions - Blue/Black/Buff Orps

[CountryMom]

Ok, I am a bit ahead of myself on this, but figured I would ask. How do the color genetics work for breeding:
black to blue,
black to black (blue backround),
black to buff
and blue to buff?

If I breed blacks and blues into buffs will that red gene (assuming that from other breeding experiences) mess up the blue/black gene? Also, is there a chance of splashes from any of these? And how does the lavender gene fit in here? And are there issues with this breed for breeding siblings together?

Thanks for any insight.

 

[Kanchii]

Black to Blue: 50% black 50% blue
Black to Black: 100% black, doesnt matter if they have blue in the bg, if there are any blue genes in them they will be blue.

No idea on the second two though!