Is this discoloring a sign of sickness?

[Misskristeen]

One of my hens used to be black with a green sheen to it, now she is mostly brown. Is this normal for end of summer and being outside or a sign of sickness? None of my other birds have this.

 

[nuthatched]

Just sun bleaching.

 

[coach723]

I agree. Feathers get duller, lighter, and rattier looking as they age. When she molts and gets a new set of feathers, they will be bright and shiny again. Depending on her age, that could happen this fall, any time now, or may not happen until next year. Once birds reach about 18 months of age they will molt annually.