If was a betting man I would load up on this one. We’re in a real dearth at the moment and also it only ever happens on days over 38deg. there is absolutely no colour to it whatsoever. I don’t want to open the hive to confirm when they are already working hard to maintain the temp. Last night by the time it had cooled back to 30 deg there was no sign of the water anymore. So my conclusion at this point is water. ( My wife has informs me that I have been wrong before though). 
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