My parakeet/budgie tail feathers are changing colors from soft whitish yellow to grey. They look almost as if they are just dirty from dragging the tail, except that the greying seems to be also along the scallops edges the wing feathers on top of her back. The last time she molted a long tail feather I washed it with soap and it didn’t return to yellow. I read some place that greying/blackening can be caused by loss of pigment especially when molting. This condition is something that has come up in the last six-eight months. The feathers don’t otherwise look unkempt or unhealthy and Yoda (she) does not behave any differently than ever. She was born in 2007… Any help on this is greatly appreciated. Yoda’s regular avian vet has seen this condition and she did offer that Milk Thistle supplement MIGHT help and I got some and have not administered it yet. At any rate I did not get the sense that this was a condition the vet was familiar with first hand and I have researched it, but to no avail…. Thank You!