My sister turned me onto something that blasts away even the most
difficult tarnish. She's an avid QVC shopper. QVC sells a product
they call Precious Jewelry Cleaner. I wouldn't get it on soft
stones. But it works, and stinks to high heaven. Better than
The reason Tarn-X isn't as good as it could be is that it's way too
dilute. The manufacturer is making it as dilute as possible, and
still work, sorta, to maximize profit, I suppose, or perhaps to
reduce potential toxicity or irritation to uneducated users. The
actual manufacturer of the chemical they market as Tarnex, recommends
a mix four times as concentrated (Tarnex mixes what the manufacturer
intends as a gallon of mix, into four gallons, or thereabouts. That
info came from that manufacturer's sales people, by the way, when I
last ordered it. I have no reason to suspect it's veracity....
The product is called CQ-2 (quick cleaner 2, I guess). It's sold as
a dry chemical. Fifteen years ago or so, a pound of the stuff cost me
about ten bucks. (that pound has lasted a long time.) The maker is
the Vin-Rock company in Cleveland Ohio. Mixed as they direct, removal
of a nice deep back sulphide (what we call oxidized finish) tarnish
layer takes mere seconds, and a batch of the stuff lasts a long time.
The main (maybe the only, I don't know) ingredient, at least the only
one listed on the label, as part of the caution's statement, is
Thiourea, which does indeed stink sulphurously... Use ventilation
and rubber gloves.