I have been looking into this.
The interesting thing is that the piece of metal (usually a coin),
shrinks in one dimension, but expands in another.
So if you shrink a coin the face will shrink, and retain the detail,
but the thickness of the coin will increase, so there is no loss in
The other interesting side effect is that the metal work hardens.
From a casting point of view this is very exciting, especially when
the shrink and expansion can be controlled.
The pieces that have worked well so far have been coins, and you can
see problems when you shrink a coin with a hole in it or a square
However if you know what’s going to happen you can plan for it
Shrinking casting attempts have failed in the past due to (I
believe) poor quality castings used in the experiments. The failures
were catastrophic, basically the castings exploded.
My contact has agreed to using some of my castings in some further
experiments. I will share results.
Regards Charles A.