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What is metal testing called? What is chemical testing for precious metals?

Metal tests reveal the property of various metals and alloys in terms of durability, strength, and failure. It decides whether the metal is suitable for the particular purpose for which it is intended to use. According to one of the best metal testing in Chennai, the metal tests are also known as metallography evaluation, metallographic examination, and metallurgical analysis. While experts use different advanced testing procedures for different metals, this blog is focused on listing a few of the chemical testing methods for precious metals.

Scratch & acid test

This is one of the most common tests carried out by gold testing labs in Chennai to determine the purity of the metal. A scratch stone is used to scratch the piece of metal and then different types of acids are poured. This method determines the karats and helps determine the value of the end product. However, this method is hazardous as the pouring of acids may burn your fingers.

Fire assay

Fire assay is one of the oldest techniques to test precious metals. Gold and Silver Testing Labs in Chennai consider this destructive method the most accurate method to test precious metals. The process involves melting the impure metal in a temperature-resistant cupel and then applying a blast of hot air in a furnace. 



Acid digestion for Silver

Often the best Silver testing Labs in Chennai use this procedure for maximum recovery and precision. This method is beneficial for low-grade silver samples as Silver can suffer from nugget effects, enabling error detection at lower levels.

Gold cyanidation

Cyanide leaches are also used to determine potential cyanide extraction efficiency for Gold and Silver. One significant advantage of this procedure is its lowest detection limits. The test procedure can detect impurities at a level as low as 0.02 ppb. Samples that are expected to have high copper sulfide concentration are tested using this method, followed by fire assay. 

Bulk leach extractable Gold or BLEG

This method uses cyanide leach on the metals. The process is helpful for large sample sizes (500 g or 1 kg) and gives the most accurate results.

Apart from the chemical methods, there are various other testing procedures for precious metals like electrical conductivity tests, XRF analyses, and other non-destructive tests. Contact Tamilnadu Test House, one of the leading Metal testings in Chennai, to test your precious metals accurately.


Ref

https://www.thermofisher.com/blog/metals/5-precious-metals-analysis-methods/

https://labtesting.com/services/materials-testing/metallurgical-testing/#:~:text=Metallurgical%20Testing%20typically%20uses%20microscopy,Metallographic%20Examination%20and%20Metallurgical%20Analysis.

https://www.alsglobal.com/en/geochemistry/precious-metals-analysis


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