They can turn colors in the cage depending on what substrate you have the snake on. Also, if you don't catch it quickly, it can mold, especially in a damp cage. Moist urates with lots of fluid passed out will turn colors much quicker than dryer urates.

I wouldn't worry about it, just keep an eye on it. If I don't catch small urates in my general daily cage check, the more moist urates have turned green or teal by the time I swap substrate at the end of the week.
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"We call them dumb animals, and so they are, for they cannot tell us how they feel, but they do not suffer less because they have no words."
- Anna Sewell (1820-1878)

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