2. Medicines made from silver compounds (this with certain
people only). This latter also (in the same persons) had the effect
of making fingernails look blue or strongly bluish.
I used to know the name of this condition, something like “arlagia”.
Afflicted workers engaged in packing industrial quantities of silver
nitrate for the photographic industry. Not just fingernails, but skin
too I believe.
But this effect arises from long term exposure. The finely divided
silver grows into the tissues from the inside. OTOH, you don’t have
to be around silver nitrate for long to discover that it quickly
produces black stains on your skin, which only really disappear when
the skin is replaced naturally. Could the same happen to teeth?
Don’t know, but possible. Wasn’t gargling with (very) dilute silver
nitrate once put forward as an aid for smokers who wanted to
quit…supposed to make the smoke taste louse (which it always did
for me anyway). I recall it from around early 80’s or so. None of
which helps explain the mystery of the supposedly
liver-of-sulphur-blackened teeth though.
Kevin (NW England, UK)