Museum specimen colour deterioration

["Peter Shute" <>]

I visited Hobart museum today and noticed some colour variations I didn't 
expect on some specimens on display:
- Purple swamphen: not purple (black)
- Tasmanian native hen: no white patches on its side.
- New Holland honeyeater: black around the eyes.
In the last case I don't know if the white in live ones is around the eyes, or 
the eyes themselves, in which case these glass eyes aren't right (or 
juvenile?). But with the feathers, can they lose colour with time?
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