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Casting with Quarters


#1

Hello everyone,

In an attempt to get a little differant look, a friend has
tried casting with quarters insted of sterling silver. You
know the sandwitch quarters. Problem: The castings have come
out of the investment with a dark finish. The finish is
difficult to remove, like fire scale. We are vacume casting.
Why aren’t the castings clean like with sterling?

I am sure the problem has something to do with the high copper
content or possibly other metals alloyed into the quarters.

Does anyone have any suggestions.

John


#2

The quarters are not silver, non what so ever. They are
stainless and copper.

John Dach

John Dach and Cynthia Thomas-Dach
MidLife Crisis Enterprises
@John_Cynthia_MidLife

#3

Hi John… i would not recommend casting with quarters…I
don’t think they were "designed for the Process"you could
vibratory them for a while… that might help clean them up. I
don’t know what alloys are involved and thereby cannot really
offer any advice other than “don’t use them” white bronze from
Oster metals in Providence RI might be a better alternative if
you want something white .

sincerely,
Daniel Grandi
http://www.racecarjewelry.com


#4

The quarters are not silver, non what so ever. They are
stainless and copper.

  John, I did a little numismatic research on the net and
  came up with the following info from the coinworld online
  site: 

  Up to 1964, U.S. quarters were 90% silver, 10% copper. 
  From 1965 to the present, except for the 1976 bicentennial
  commemerative coins, the quarter is a laminate with the
  core layer being pure copper, and the outside layer being
  75% copper and 25% nickel.    For '76, the proof sets and
  uncirculated sets sold for collectors had outer layers of
  80% silver and 20% copper, and a center core of 21.5%
  silver and 78.5% copper.   This source, unfortunatly,
  doesn't say what the relative thicknesses of the core and
  outer layers is, so we still don't know the alloy of a
  melted down quarter.  But it's probably fair to say it's
  mostly copper, with a bit of nickel... 

None had any stainless steel.

Hope this helps.

Peter Rowe