"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.