"RG" wrote in message
news
On Mon, 31 May 2010 15:08:19 +0100, David WE Roberts
wrote:


"alan.holmes" wrote in message
news:LGvMn.28769$9J1.20264@hurricane...
As one does every 20 years or so, I can across a HUGE bag of something
called 'Phosphoric Acid' which I obviously bought for some use, but
what was it used for?

When I first saw the bag the words 'growmore' came to mind, but bearing
in mind the reliability of my memory it could be anything!

So, what sould I be using it for?

IIRC phosphoric acid can be used to etch glass - although a customised
grenhouse seems a little OTT :-)

However this would be a liquid, not a solid.

YDRC.
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.

--

Jeff