On Sun, 23 Aug 2009 14:19:36 +0100, Pete Verdon wrote:

It's difficult to tell - he's just written back and said that he's

fulfilled his legal requirements (the name was correct, the
concentration was wrong)

That's ********. If he offered "Isopropyl alcohol 99.4%" and you bought
it as such, then that's what it has to be.

Quite. It could be a labling error or he could be trying it on.
Before taking further proceedings it needs to be acertained what the
concentration actually is.

I'm not sure how one could do that simply at home. I guess one could
heat some gently in a pan with a thermomter and slowly drive off the
alcohol until the temp starts to rise significantly above 82C (IPA
boiling point) and see how much liquid is left at that point. If
there is still 25% or so left you don't have 99.4%...

You'd then need to get a proper analysis done to have a case for
trading standards/court.

--
Cheers
Dave.