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  • Initially when I noticed them for the 1st time a few years back I thought that might be something to do with getting high.

    You might be right, but I ussually see them on the road as some one stoped and mended on the spot. Not a forensinc but seem they were dropped from a low height as they are not widely scattered(too much explanation).

    I would guess if it were kids fooling around they would be a bit more secluded I guess. Also encounterd them on lanes too.

  • If you do want to do the forensics, CO2 cartridges are steel and usually threaded. NO2 are aluminium, and therefore lighter and non magnetic, also not usually threaded. I think.

    Me I use Helium.

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