Read the ingredient in Pesi or Coke and you'll find that it includes
phosphoric acid, so I guess it must be food grade, too.
Roland
On Sat, 29 Apr 2006 14:23:08 -0400 Mark Mason <mason@postdiluvian.org>
writes:
>
> Personally, I gave up on the "magic" rust removers, they are all
> just
> acids of some sort - usually phosphoric. If you read the MSDS for
> the
> rust remover it will usually say it's a proprietary formula with a
> pH
> quivalent to a soft drink, or something like that. You can get the
> same acid that's not sold as a rust remover for a small fraction of
> the price. I got a 5lb bag of citric acid powder for around $15,
> enough to remove a lot of rust, and it works as well as any of the
> expensive stuff.
>
> I have mixed it up in a kiddie pool for doing larger sheet metal
> pieces. If you have something really big then you could make a
> pool
> of the right size with a temporary frame and some plastic sheeting,
> or
> trash pick an old fiberglass bath tub.
>
> The nice thing about citric acid is that it's safe enough that you
> can
> use it to perk up a dull Gin & Tonic, most of it's even food grade.
|