Hi All,

Having mixed oxalic acid syrup for trickling for a single hive, I was left 
with half a liter of the mixture. After half a year standing on the shelf in 
a clear bottle it starts to turn yellow now, so something seems to be going 
on in there. Is this still effective against varroa? Or should I just throw 
it away and make a new batch?

Thanks for any hints,

Remco

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