For the lav, cross her to the black. You'll have black chicks split to lavender (they will be black colored). You can then breed the splits together and they will give you 25% black/black, 50% black/lavender, and 25% lavender. Or breed back to the lav and you'll get 50% black/lavender and 50% lavender. You actually want to breed that way with lavender, because lav to lav will produce inferior lavenders. Hope this helps!
What if it's a black split to choc. Them what would happen? Thanks for the tips.