That could be the answer then Paul. I have always assumed it was dry ice but as I am still alive it may well have been the other.
I realise that health and safety is rather more stringent now than it was back in the mid 60 s but even then I doubt that they would be using it if it was that dangerous. Then again, when I think back on my Chemistry master then anything would have been possible.
1 Like
I know for certain I did some things in A level chemistry in the early 80’s that would not be allowed today 
1 Like
no, they mix liquid nitrogen int their cocktails instead the idiots. They think its great, if only they knew