I do cast quite a bit. At least twice a week when busy. I have
recently started to cast white and yellow bronze. I hope to mix my
own metal this week. My castings have been excellent except on one or
I have questions on two things. The first is any quench time? Do I
even bother to quench? With casting gold, silver, and platinum I
always have. I don’t believe a foundry can quench a bronze casting.
The second is a remelting old sprus. Again is the spru button
remelted with new added? Many times with gold and silver I’ll remelt
several times without adding new. I have so far been mixing about
50/50 new and old.
The cast that did not turn out was very brittle and the pieces broke
Melt temperature for both is 1900f.
With the bronze I’m mixing myself I should be able to save a bit of
money, but it’s not too expensive anyway. I’ll let everyone know the
result of mixing your own. You can buy a pound of bronze for about
$12.00. That’s about .05 cents a pennyweight. The white bronze has a
good looking color.
I also have started to cast Nickel Chromium which is the material
for all the white metal class rings. This is a lot harder to do than
our traditional silver and gold casting. A lot cheaper than you can
believe, but very much like casting Platinum. The main problem I see
here is the investment removal from the casting is traditionally done
with hydrofluoric acid which is quite nasty stuff. I have some of the
Densply NeyClean SP investment remover, but it does not work well on
the higher temperature investment. Any ideas?
Hopefully some answers will come from someone who is actually doing
this. My research has lots of answers. I’d like to talk to someone
who is actually doing some of this.
Best regards & thanks,
Southeast Technical College