I have seen her odd markings, but I don't think that changes her colour mutation. She can have some type of feather condition, or maybe someone tinged the feathers and it comes out after bathing.
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RIP sweet Tito (Summer 2008 - January 17th 2013).
You are missed and never will be forgotten.
Thats really unusual those markings on the birds chest, looks like it has spangles on its front, wonder if they dissapear after a moult. could be a new type.
I agree with Allie, it looks like stress barring to me as well
The outer edges are the first parts of the feather to develop, so it would make sense that it occurred when she was at the start of a molt and the feathers were just beginning to develop. The pattern is different than a sf spangle markings since only the very edges of some feathers are effected.
Is this your bird, or photos you found online?
She looks to be quite mature, and in the process of or just finished breeding given that you can see her brood patch on her belly