Wow, no clue. Might be easier to see the lacing with black?
Awaiting answers to both these questions.. very very interesting...
All partridge chicks - WHAT is under that black? .. How many chicks hatched? I can't get statistics to give me all partridge from any Black x Self Blue crossings no matter what I hide in there - only 1/4 would be partridge ...
Now going to go check what two copies of lav does to Partridge.. hmmm.... Ooooooo- Those are beautiful! Isabella colored partridge! WOW..um.. is that the ones that are being called Porcelain or Self Blue Creme? Oooh, they are pretty!
Sounds like you already have Partridge under your Lavender hen... Not sure how it would hurt the Self Blues? Only concern is you might get Porcelain/Blue Creme and Partridge instead of Self Blue in future generations because you would only have the one E-based aliee to share among the children - giving you only 25% chance of Black/Self Blue?