Thanks Godzilla - I didn't leave them out to breathe for more than a day, but smelt and tested on the same night. Last night threw away some of the foreshot I collected and labelled "Nail Polish Remover" and I could really smell the acetone - hence why I kept it. The first time it was used it took the nail polish right off, but my daughters now reckon its shite, so chucked it out. But it did remind me of what smelt bad. So will leave them out a couple of days now and try again. Will be doing a TPW sometime later this week so can test it out.
Cheers