I have been toying with the idea of doing some small-ish castings recently.
I have built my furnace (charcoal fired), which worked surprisingly well for melting some aluminium scrap.
And I have found a cheap source of low melting point (unknown) alloys.
I live about five miles from a vehicle crime "blackspot" and there is usually at least one newly burnt out car every day whilst walking the dog. When these cars are removed, there are usually "puddles" of alloy left behind - sometimes obviously the remains of alloy wheels, but often just melted components.
Over the last three months, I've managed to collect about 100lbs of these.
I have some bits which are obviously lead, and some which are obviously aluminium, and quite a lot (say 90%) which are not obviously either.
I'm not doing any critical castings - mainly ornamental.
I have no way of controlling or measuring the temperature in my furnace.
Is there any (cheap) way of identifying what the alloys are? Will it cause any huge problems if I just melt all the lot together?