The new stuff from Brownells seems to be the same as the old Herters stuff,,including the Mercury Bichloride chemical agent. So handle with care. Also, if you use any of these older formulas with the mercury bichloride compounds in them (that's one reason they work so well!), the mercury will precipitate out onto any precious or semi precious inlays on the steel and they will be coated with the mercury. It does not remove easily. The normal carding will not take it off the inlays. So very carefull application of the solution is necessary. Personally, I'd just stay away from the mercury all together. It will be in the carding dust in the environment of your shop, your clothes, your lungs, etc forever.
