What to use to make a mold?

On Mar 24, 12:24*pm, The Real Doctor
wrote:
On 23 Mar, 07:45, Ian Burgin wrote:

Lead has a melting temp of about 500 degrees C ...

It might be worth thinking about using plumber's solder instead. It's
a lead-tin eutectic alloy, which means it melts at a significantly
lower temperature (183 degrees C), but still has a high density (84%
that of lead).

Ian

Do you know of good source for this alloy (I don't know if I want to
go to Radio Shack to buy 40 lb of solder? My wallet would be way too
light and then I would have to buy even more of the alloy.

On 24 Mar, 23:20, AK wrote:
On Mar 24, 12:24*pm, The Real Doctor
wrote:

It might be worth thinking about using plumber's solder instead. It's
a lead-tin eutectic alloy, which means it melts at a significantly
lower temperature (183 degrees C), but still has a high density (84%
that of lead).

Do you know of good source for this alloy (I don't know if I want to
go to Radio Shack to buy 40 lb of solder? My wallet would be way too
light and then I would have to buy even more of the alloy.

Builders' merchants used to sell it by the kilogram, but it's banned
or about to be banned for domestic use so may be harder to find in the
UK now. Dunno about where you are.

Ian