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In article ,
Jeff Layman wrote:
"RG" wrote in message
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A very strong solution will certainly etch glass.

Do you have a reliable reference for this, please? Google most certainly
comes up with quite a few hits for "phosphoric acid" and "etch glass", but
I
have been through the first 40 and found nothing which substantiates that
statement unequivocally. I have always understood that the only chemicals
which attack glass are (1) hydrofluoric acid (2) strong alkalis.

That is definitely wrong. Glass is etched naturally in the soil, for
a start.


I take your point - it's been noted with fulvic and humic acids. But I
should have made it clear that I was considering visible chemical attack on
a much shorter timescale.

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Jeff