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2. Karatmeter - Wikipedia

   en.wikipedia.org/wiki/Karatmeter

   It also accurately (up to 10-12 microns) determines the element composition of all types of gold, white gold, platinum, silver, palladium, rhodium and related alloys. Energy dispersive X-Ray fluorescence (ED-XRF) is a simple, accurate and economic analytical methods for the determination of the chemical composition of many types of materials.

3. Touchstone (assaying tool) - Wikipedia

   en.wikipedia.org/wiki/Touchstone_(assaying_tool)

   This method has been used since ancient times. In modern times, additional tests can be done. The trace will react in different ways to specific concentrations of nitric acid or aqua regia, thereby identifying the quality of the gold: 24 karat gold is not affected but 14 karat gold will show chemical activity.

4. Screen-printed electrodes - Wikipedia

   en.wikipedia.org/wiki/Screen-printed_electrodes

   Silver/silver chloride is an industry preferred reference electrode because it has stable electrochemical potential under numerous measurement conditions. This makes silver/silver chloride ink a good choice for a variety of medical and industrial applications that require conductive ink, such as biometric monitoring or heavy metal detection.

5. Electronic Product Environmental Assessment Tool - Wikipedia

   en.wikipedia.org/wiki/Electronic_Product...

   The Electronic Product Environmental Assessment Tool (EPEAT) is a method for purchasers (governments, institutions, consumers, etc.) to evaluate the effect of a product on the environment. It assesses various lifecycle environmental aspects of a device and ranks products as Gold, Silver or Bronze based on a set of environmental performance ...

6. Metallurgical assay - Wikipedia

   en.wikipedia.org/wiki/Metallurgical_assay

   A model of a late 19th-century Canadian seal used to certify the quality of assayed gold. A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.

7. Flowers of sulfur tests - Wikipedia

   en.wikipedia.org/wiki/Flowers_of_sulfur_tests

   There has been recent development in utilizing FOS testing for porosity of conformal coatings. [7] Nominally 1 square centimeter silver coupon cleaned per ASTM B810-01a (Reapproved 2017) Cleaning Method I. The material under test is suspended inside a container over a source of powdered sulfur. The powdered sulfur is placed in a dish.