I think that they are speaking of the trace amounts of Mercury in the primers... Not that big a deal... Mercury is and was used in so many different products for so long, and the effects of it are, in my opinion a little over blown..
It has been used much larger amounts in positions sensor switches, common house hold light switches, doctors thermometers (remember the big ones that used to hang on the wall in every dr's office in the land). fire suppression rain heads, electrical breakers, Jewelers, and precious metal recyclers use it to recover gold and silver. And it is GREAT for getting heavy lead buildup out of pistol barrels... It is in EVERY one of the new government mandated florescent light bulbs... Go figure..
A minor trace amount in a primer is not something that I would live in fear over... however, I wouldn't really be trying to take a big hit of the stuff into my lungs...
Moderation in all things..
Actually, it is fulminate of mercury in those primers... I'm not sure how that changes the health implications... I do know that fulminate of mercury has been used in primers and in Mil ordnance and kitchen matches for over 100 years.. hand grenades, artillery shells, small arms.. etc... I remember many years ago our Bomb Squad recovered some old WWII Japanese hand Grenades, and some old German Potato Mashers that you could see crystals formed around the threaded joint on the striker caps (German stuff) and on the thread where the fuse was threaded into the body of the Jap stuff.. they said it was crystallized fulminate of mercury and that they were not going to try and open them as the friction of turning the cap or fuse could detonate due to the properties of the fulminate.. (I thought they would be cool collectibles if de-milled)
Me I dunno... I was happy to take their word for it and walk away... They were the ones with the bomb proof underwear..