Hello,
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If you
bought the balls in the tinkering business, they are in all probability from
aluminium or metalized plastic. One cannot enamel both.
But the
most the goldsmith supplier have filigree balls from Sterling or 835/1000part
silver in the stock. The 835 silver is not so good for enamelling, because the
melting point is very low. But Sterling you can enamel. If you use opaque
enamel, you must only clean the surface of the balls before enamelling. If you
want to use transparent enamels, you must prepare the balls before enamelling
in the following manner:
Anneal the
balls for a few seconds to about 600-650 degree Celsius (1100-1200 F) = dark
red colour. The surface of the balls get dark grey.
Pickle the
balls until they get white.
Anneal and
pickle again for about 3-4 times. At last polish it is in a tumbler.
You must do
this procedure for silver alloys to get a thin fine silver coat on the surface
of the silver. If you do not this procedure, the most transparent enamels get
muddy and change there colour dramatic. And mostly it is recommendable to shift
the silver at first with a silver-flux and after burning that the favoured
transparent colour.
Edmund