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If you are trying to combine two autosomal recessive colors (bronze, opal, midnight, charcoal, jade, taupe), you will need to have the gene in each parent in order to have a chance at having offspring that are visual for both. If you have only one, you won't have visuals in the next generation.
IB split Opal and Bronze X Bronze =
1/4 IB split Bronze
1/4 IB split Bronze and Opal
1/4 Bronze
1/4 Bronze split Opal
You won't be able to tell which are split to Opal and which aren't.
IB split Opal and Bronze X Opal =
1/4 IB split Opal
1/4 IB split Bronze and Opal
1/4 Opal
1/4 Opal split Bronze
Again, you won't be able to tell which are split to Bronze and which aren't. If you wanted visuals in the second generation, you'd need to pair a male IB split Opal and Bronze X female IB split Opal and Bronze. If you used two unrelated Opal females with one unrelated Bronze male (or vice versa), you could pair half-siblings together, and lessen the degree of inbreeding to get your F2's.
What you'd need to do is get a female that is split to Bronze and Opal, and pair her to your male. If you bred the two together, then 1/16 would be Bronze Opal (with equal probability of being male or female). 3/16 will be Bronze (and 2 of these will also be split to Opal, but you wouldn't know by looking), 3/16 would be Opal (and 2 of these will also be split to Opal, but you wouldn't know by looking), and the rest will be IB (some split to Opal, some to Bronze, some to both, some to neither).
Once you get birds that are Bronze Opal, you can outcross to unrelated birds that are Bronze or Opal. Those offspring will be colored like the single-color parent, but be split to the other.
Bronze Opal X Opal = 100% Opal split Bronze.
Bronze Opal X Bronze = 100% Bronze split Opal.
You can then breed back to the Bronze Opal.
Bronze Opal X Bronze split Opal = 50% Bronze Opal, 50% Bronze split Opal
Bronze Opal X Opal split Bronze = 50% Bronze Opal, 50% Opal split Bronze
If you continue to choose an unrelated Bronze or Opal for outcrossing, you will minimize inbreeding.
You'll have to hatch a bunch of babies to get your first visual, but after that, your odds go up of getting more.
If you try combining one of the sex-linked colors (Purple, Cameo, Peach, Violetta) with an autosomal recessive color, you could do it in the second generation by using a first-generation male with females of the autosomal recessive color. In the below example, you can switch Purple with Cameo or Peach or Violetta, and you can switch Bronze with any of the other recessive colors.
IB split Purple and Bronze X Bronze =
1/8 male Bronze split Purple
1/8 male IB split Bronze and Purple
1/8 male Bronze
1/8 male IB split Bronze
1/8 female Bronze
1/8 female IB split Bronze
1/8 female Bronze Purple
1/8 female Purple split Bronze
It will take a bunch of pen space, and a few years, but, hey, it'll be 2020 in nine years whether you start this or not. And based on the feedback I've gotten when I first asked if anyone tried this, you'll be one of the first. Kinda cool, huh?
Clifton Nicholson sent me some pics of his Purple Bronze -- they look a lot like Opals, but with more iridescence in the neck. Opals have intermediate iridescence -- not as "shiny" as IB, Bronze, Purple, Midnight and Jade, but more "shiny" than Cameo, Peach and Charcoal. If you want to try combining colors, I would suggest that you keep iridescent with iridescent, since the "matte-finish" of the others might make the color less distinctive. The barring on the wings was a light milk chocolate brown, and the legs and belly were a darker chocolate brown -- not black as in Opals. The Train has the "Bronze motif" but in a lighter, faded set of hues, and the eyespots resemble those of the regular Purple. He asked me not to share the pics, which I must honor, but I suspect he is preparing to submit an article to the UPA in the near future (hopefully...), so we can see for ourselves.
Good luck...I'll be looking you up in a few years to buy some.
P.S. To anyone willing to try, I'd be more than happy to advise from a genetic standpoint, and give probabilities of outcomes. I'm just trying to help you make something cool.
P.P.S. Thanks for correcting me on the inheritance mode of Violetta, team!