Ammonium bifluoride is an etchant. It will hydrolyze in the presence of
water and give you hydrofluoric acid. Although the HF will be somewhat
dilute, be cautious. I have had some of my worst acid burns from HF.
Many years ago HF used to be supplied in waxed cardboard containers
(before the advent of plastic, Nalgene containers) since it will
dissolve glass. Frequently it leaked from these containers. It has low
surface tension and penetrates the skin and then starts to burn out from
the bone, much like glacial acetic acid. It can ruin an otherwise good day.
I doubt that this will remove the rust stain, it will most likely remove
the concrete that has been stained if it does anything beneficial.
Gloves and goggles would be a good investment. As with any acid add it
slowly to water, don't add water to it.
Jerry Pinsky wrote:
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