After the report of damage to open brood after vaporizing Oxalic acid, I 
decided to look for myself.

Seven days ago, I began OA treatments, using a 12v vaporizer. First, I 
checked the brood.I marked combs with older unsealed brood, and combs with 
young unsealed brood and eggs. I then vaporized 2gr OA, with hive sealed.

Today, I repeated the process. Before vaporizing, I checked the previously 
marked combs. I could find no damage to the brood. Most of the brood has 
been sealed, with what was eggs seven days ago, remaining unsealed. All the 
brood looked healthy.

Now, to see if it works. I did an alcohol wash on several colonies, and 
will repeat a week after the final treatment.
Mike


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