alasdairm -
thanks for the link. i had actually checked my post against the label of a bottle - Golden GS - of poppers. it labelled the active ingredient as amyl nitrate; and although i should've known otherwise, it was a simple mistake (or a compound mistake, given that both i & the manufacturer were wrong). nonetheless, i'm sure you can appreciate how it happened. i am fully aware of the necessity for correct information in harm reduction terms; you're preaching to the converted my friend. i've done a lot of work for this site & others over the years, and although it's unlikely anyone would use nitrate in a bong, or ingest it as poppers, i can see your point.
sorry for posting misleading information. i will leave the above post intact as a lesson to everyone (mainly me) - don't trust the labels of shitty camden market poppers!!!