Foam

[Craiga 01453]

Not to seem disrespectful or anything, but I'm pretty sure urates doesn't look like foam (at least Pylox's doesn't ), Pylox's looks more like a blob of chalk

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No disrespect taken. It just sounds like urates based on the limited info at hand. They can vary in texture. Sometimes they're wetter and looser than others. Sometimes they're practically dust, like the chalk you described.

I'll hazard a guess, since without a photo, it's impossible to know what you're seeing. Sometimes their urates are expelled with more liquid (& 'gas') than
usual. Not a big deal, if that's what it is.

That was my thought too. Logically, I can't think of what else it would be.