Hi Chris,
It wouldn't be dangerous to your customers, but if there were any residues
remaining on the cappings, they could be very easily detected by
taste--just touch the cappings with the front edges of your tongue (not
combs that you intend to sell).  If they taste tart, that would indicate
acid residues.

If the combs are fully capped, a quick rinse with clean water should wash
away any residues--follow with a quick drying to avoid absorption of water
into the honey.  I've not tried this, so test first to make sure.

Randy

On Sun, Oct 21, 2018 at 4:09 PM <
[log in to unmask]> wrote:

> I generally take my share of honey from my top bar hives in the Spring,
> when the willows and dandelions are starting to flower, knowing that the
> honey is truly surplus to their requirements and, as I haven't fed them,
> isn't partially recycled sugar.  Much of the honey is pretty enough to be
> sold as comb honey. If I dose my top bar hives with oxalic acid vapour in
> the winter will there be a deposit on the comb surface about 3 months
> later?  If so, would it be dangerous to customers?
> Chris
>
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-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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