How long sgould one allow a freshly cast object to cool
before quenching and removal from the flask?
as far as i know, one should check with ones own particular
the rule of thumb that i was taught was to make sure the red was
out of the button in a dark room. that was the soonest a flask
should be quenched.
my own metal supplier suggest to wait at least 8-10min before
quenching for yellow gold and longer for white, 10-15 min.
sometimes i will do a frying pan test: put spit on my finger
and see how actively the spit will be boiled by heat of the
flask. if your finger sticks, the flask is too hot. JUST
KIDDING! cautiously apply the finger with spit on it.
it does sound like a hot tear on your silver ring, but
personally have nevr seen a ring split in the manner you
describe. usually the tear occurs next to the sprue or where the
mass of metal drastically changes.