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> 
> Anyone, I don't know if you've checked the TLV's (threshold 
> limit values of
> vapor) of oxalic, but the vaporized gas is pretty hot stuff!  
> The TLV of oxalic is 1mg/cubic meter.  For comparison, the 
> TLV of formic acid is 9.4mg, for acetic acid 25mg, for 
> ammonia 17mg, chlorine gas 1.5mg, hydrogen sulfide 14mg, 
> hydrochloric acid 7.5, benzene 1.6mg, and toluene 188mg.  I 
> arbitrarily listed some dangerous vapors for comparison.
> 
> If one is vaporizing 1.4g of OA per colony, and half of it 
> vaporizes, then you've created enough vapor to make 700 cubic 
> meters of air dangerous (that's about a 50ft square house!)  
> That's per colony treated!  
> 
> Am I being too cautious?  There have been a number of formic 
> acid inhalation injuries and deaths, is OA vaporization in 
> the same risk group?  The websites Mike referred to say it's 
> safe, but I'm curious.  Anybody have a better handle on just 
> how dangerous vaporizing OA into hives on a large scale is to 
> the beekeeper?  Will one good accidental breath kill or 
> seriously harm you?
> 
> Thanks,
> Randy Oliver

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