A tale of two batches of metal

 

In the future I hope to start a new line of jewellery using salvaged silver that has been melted and rolled into strips about 1-1.2mm thick.

Whilst giving Fiona a bit of a hand with a couple of her experiments I decided to melt a second batch of silver objects I had been gifted - earrings, bangle, chain etc. I was melting the metal in my electric furnace. I set the temperature at 930 degrees to see if the metal would melt at that point. See below  very hot furnace with molten metal in the graphite crucible.

I poured the metal into the metal form you can see sitting on top of the furnace to warm it up. It poured well. But when It came to cutting the metal it simple shattered as you can see from the opening photo. And when Fiona tried to put a piece through the metal roller it just turned into particles as you can see in the photo below.

I have no idea why the metal just turned to a crystaline form. It has happened to me a couple of times in the past. All I can think is that some of the silver metal objects gifted to me must have had impurities that causes the metal to change character when mixed with other salvaged metal.

Fortunately I had done a silver metal melt earlier and when I cut that metal into strips it rolled well - quite hard but able to be used in the future work. Some annealing and rolled metal photos follow. The metal strips when rolled went from 50mm to over 100mm.

It just reinforces that using salvaged metal is always a bit of a lotto as one can never be guaranteed of the quality of the material. 

I re-melted the shattered metal and turned it into stars!!!! See below - a lot of colourful impurities!!!