I do understand you are very knowleglable about colour mutations of budgies, but violet forms and yellow-faced blue budgies are very tricky to exmine and to name correctly.
I am researching my yellow-faced blue budgies and violet budgies, and I am learning much about which is which the budgies.
I were knowleglable about budgie mutations.
Lyn's pet budgie Indgio is a single factor yellow-faced type 1st violet-cobait normal budgie. His central tail feathers are entirely dark bluish purple, a sure sign this bird is a violet-cobait, in single factor.
I had only have one double factor violet-cobait budgie in juvenile plumage, but I sold the bird, to petshop.
Double factor violet-cobait budgies are true purple-bodied budgies, and colour are darker than single factor violet-cobait budgies.
I have a single factor yellow-faced type 2nd violet-cobait normal male budgie, his colours are not bright, had puplish-blue belly and foam sea green breast as in my two photoes, with a single factor yellow-faced type 1st skyblue opaline spangle.
I have a 2-month-old single factor yellow-faced type 1st violet-cobait normal female budgie in her juvenile plumage. Her cheek, nape,forehead feathers had not moulted yet. Her eye iris are grey.
Lyn's pet budgie Indgio's plumage is bright, with creamy face, and purplish blue body....beautiful wonderful bird.
I will send you more photoes of yellow-faced blue budgies and violet budgies when I have time.
First photo of central tail feathers, the left feather is of single factor violet-cobait, while right feather is of double factor violet-skyblue. Please look at my photoes.