>
> >Oxalic acid mix can be good for a week if stored in a refrigerator. All
> depends of storage temp.


At refrigerator temperature in a nonmetallic container, there is very little
HMF formation for a long period of time.  As Medhat says, temperature is
everything.


> >In your case, check the color of the mix in the sprayer. If it is still
> white. It should be good. If it is off white to yellowish it will not be
> good. It means that sugar has formed HMF and the mix is no longer good.


We use the same visual check, although the color is not due to HMF, but
rather to another chemical process, which seems to act as a good indicator.
We have no problem with oxalic syrup stored at cool temps for over a week.

Be aware that oxalic dribble at this time of year, when there are a lot of
mites in the brood, will not give very effective control.  But it works well
in nucs made with queen cells at about Day 20 after making the nuc, when you
have a very short window when there are virtually no mites in the brood.

Randy Oliver

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