Precious Metal Tester You Should Know
Posted by zhisheng45
from the Agriculture category at
12 May 2022 08:15:58 am.
Touchstone (Hand Test)
This is the simplest assay to perform and has been in use since ancient times. The central tool in a stone assay is a touchstone (hence the name), which is usually a dark, hard stone with a finely grained surface.
Electronic Tester
Portable electronic gold tester work by measuring the electrical resistivity of the test sample. Resistivity quantifies how strongly a given material opposes the flow of electric current and is measured in ohms (Ω).
Fire Assay
This complex assay is widely considered to be the most accurate way to test for gold purity. However, it’s usually reserved for large lots or bullion because of how destructive it is. First, the sample is mixed with lead oxide and a few control substances are melted together at about 1650 F.
X-ray Fluorescence
Also known as XRF, this type of assay is much more complex than a stone assay. XRF assays are known for being fast and accurate tests that do not damage the metal being tested.
Ultrasound Assay
This assay uses ultrasound to measure changes in the consistency of the material being tested. To conduct the test, an ultrasonic flaw detector generates an ultrasonic pulse and emits it via a transducer that is pressed against the sample. (diamond and moissanite tester)
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