am clear on the effect of Boron and others but Lead i am not sure
about other than of course its poisonous. Can it cause a violent
reaction or not, does the silver become unstable when entering the
I too have done castings in fine silver, and the castings have no
I think the trace elements will not effect much even if it is lead,
the reason i think may be incomplete bunout in both the cases. Due
to incomplete burnout the trace elements may have reacted and caused
the trouble that is due to carbon film remaining in the cavity of
the mould it must have prevented the air to escape through the mold
cavity when the metal is injected in to the mould,and this is known
as back pressure porosity,even if the metal has no trace elements as
lead or other elements.
Ask the casters that the burnout was perfectly done or not?
Hope this will give you some idea to think about the problem in one
direction of many causes.
Wishing all my Orchidian friends a total health Physical, Mental,
Spiritual and Social.
Srrive to be Happy