I have an interesting dilemma to propose to the group. Normally, we
cast precious metals, etc. for making jewelry. However, I have been
challenged with trying to duplicate a key for an antique lock, which
needs or probably should be made out of brass. So I took about 10
brass keys that I had laying around, and melted them down and added
some borax as we normally would do during the casting process. The
casted key came out perfect. But the problem is that the key bends
too easy. Anyone know what I can do to harden up the brass metal?
It appears that when I melted the keys, they lost their hardness.
Is there a brass casting alloy that I can use instead of melting
keys or is there something I can add to the melted keys while it is
molten to harden it back up? I am not experienced with much other
than the precious metals. Since I have the mold, it would be easy
to re-cast the key. Thanks for your help.