Evaluation And Interpretation Of The Results - Goldanalytix GOLDSCREENSENSOR Instruction Manual

8

Evaluation and Interpretation of the Results

The following chapter gives you hints for the interpretation of the established conductivity.
Please keep in mind that this device only shows the conductivity of the object and deduces from
that, which material it could be. The GoldScreenSensor only measures the electric conductivity.
This is why we additionally recommend in case of doubt the use of a conductivity value
reference table (see annex of the manual). The following factors can however distort the results
 Scratches
 Blisters & bars / other packages
 Temperature effects (temperature of the device differs from the one of the measured
object, etc)
 Striking on coins or bars
 Bends and deformations
 Uncommon coins or impurities with ferromagnetic material
PLEASE NOTE: A correct conductivity value is no guarantee that your object is not a fake. The
GoldScreenSensor is a penetrating eddy current measuring device and no independent fake
detector. The reason is that an alloy with the same electrical conductivity as gold can definitely
be produced (e.g. copper alloys), but in this case the coins' oder ingots' dimensions or weight
will not be correct. We therefore recommend turning to several examination methods to
exclude counterfeits with certainty.
In case of coins, we recommend the following procedure:
Step 1: Establish the weight with a precision balance – does it correspond with the set value? In
many cases, fakes are already detected here.
Step 2: Compare the dimensions (thickness and diameter) with the set values of the desired
coins with an electronic slide gauge (can be purchased for a reasonable price in our online shop
or at specialist shops) or stencils.
If 1 and 2 correspond exactly to the set values (can be found on the Internet, e.g. on the
websites of the producers), it can only be a fake with material of the same density – in case of
gold, these are for example metals like tungsten or uranium (the latter can be ruled out for
obvious reasons) or in case of silver, e.g. mixture of lead and tin or even molybdenum.
Step 3: Detection of lower alloys and counterfeits made of e.g. molybdenum, tantalum or
tungsten, tungsten alloys, tungsten carbide, brass, copper and so on up to a penetration depth
of about 250 µm (in case of silver) up to 650 µm (in case of Krügerrand) with our
GoldScreenSensor (pure gold: ca. 350 µm).
There is no individual non-destructive method which can give you a reliable answer to whether
the tested precious metal is genuine or not. If anybody tells you something else, this person is
definitely not honest or does not know it better! The reason is that any physical property (i.e.
conductivity, density, sound, etc.) of any precious metal can often be imitated relatively easily
with certain materials. However, materials – especially for precious metals – which are identical
26