On 14/11/15 12:37, Robin wrote:

But JOOI, Superdrug sold me 50ml for 79p; so where please do you get a
litre of acetone for 16p? Or even for 79p?

But your 50ml bottle did not contain 50ml of acetone, most of it was water.
I pay about £15 for 5l of pure acetone, use it for cleaning steel prior
to tig welding.