> My early experience with oxalic acid is in household use... I have
> about 1 cc of it in a tightly covered bottle, marked with a
> skull and crossbones and kept very well away from others, which I have
> guarded carefully for many years.  If it is available in the present
> day, I would really like to replenish my supply!  Where do I shop?

I called my local drug store and the retail price for 500g (~1 pound) of oxalic
acid crystals is $11.19 CAD (~$8.00 US). It is used to take rust out of things.

That amount, if it is the correct product should -- according to a previous post
and if my math is correct this time -- treat 168 strong colonies at a chemical
cost of about 6 2/3c CAD each or 5c US.

I asked the druggist if his product is the dihydrate or not, and the druggist
did not know.  He said that the label mentions two molecules of water in the
crystals, but did not say 'dihydrate', just oxalic acid.

To me, a dihydrate should be an acid molecule with two molecules of water.  But,
I should also have imagined that the dihydrate would be liquid.  Maybe not.

To those who use have used oxalic acid dihydrate:  what exactly is the dihydrate
form?

allen
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