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Ferro magnetic materials and impurities:
Ferromagnetic
materials
and
impurities
can
affect
the
measurement
with
the
MagneticScreenScale, as even small amounts can lead to misinterpretations.
Certain alloyed gold coins, especially old coins before 1945 and coins of the Latin Mint Union,
Vreneli, Krone Austria, American Eagle, Krugerrand, UK Gold Britannia (before 2012) and other
alloyed gold coins, may contain small amounts of ferromagnetic materials such as nickel, iron or
rarely cobalt. This can lead to unexpectedly negative measured values, as ferromagnetic
materials are strongly attracted to the magnet and even slight additions of these materials lead
to an overall negative value. It is therefore important to bear this in mind when interpreting the
results.
IMPORTANT:
Special attention should be paid to negative values for pure gold or pure silver, as
the addition of nickel to these coins and bars would be highly unusual. In the case of negative
values, especially values below -0.050 g, extreme caution is required, and the objects should
always be checked more closely. One exception we have found for silver coins is the Australian
Koala (1 ounce), which has probably been treated with a ferromagnetic material and therefore
displays a slightly negative value (despite the authenticity of the coin). In most cases, silver coins
have a purity of 999.0 per mille fine silver content and not 999.9 mille, which is why also other
silver coins may contain ferromagnetic materials in the remaining thousandth.
If ferromagnetically contaminated, paramagnetic cores are present inside of test objects (e.g.
tungsten-copper alloy with traces of iron), strongly negative values of -1 g to -6 g can occur. In
the case of uncontaminated paramagnetic cores, however, the negative deflections would be far
less pronounced.
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