Please, I need some help/advise:
I went through the archives and found a lot of on IT and
eutectic silver solders. The specific use is to solder a fine silver
cage for Plique-a-Jour enameling.
I just made some eutectic solder for enameling (72% fine silver and
28% pure copper). I was very careful to clean the fine silver and
copper before weighing on a digital scale.
I then melted it together on a charcoal block with an acetylene
torch using a flux made of half borax and half boric acid. I melted
and stirred with a
Wood dowel, let it solidify and then melted and stirred again twice.
I let it cool a bit and then into pickle made of sparex.
The problem: the top surface of the ingot (10 grams total) was
copper colored! The bottom was a nice silver color. The copper looked
like a plating
That you can get with contaminated pickle (by iron). The copper
coating could be brushed off by hand with a brass brush.
I used a coarse file to create filings and soldered a piece (using
Battern’s flux) that survived 1435 in the oven for 120 seconds. The
piece was a 5 mm long rectangle 2 mm wide soldered at a 45 degree
angle by an acetylene torch and then placed in a dental porcelain
So the solder works just fine but the copper coating only on the air
surface is a mystery!
Does anyone have an explanation?
Charles Friedman DDS
Ventura by the Sea