Miten kullan pitoisuus testataan?

Toinen tärkeä mittaus on tiheysmittaus

Se tehdään näin:
http://www.youtube.com/watch?v=uebkSwsmkyg

Suurimmalle osalle kolikoista riittää koon (halk, paksuus) ja painon mittaaminen

Kulta on lyijyä selvästi tiheämpää (raskaampaa)

Kustannuksiltaan sidettävä on myös ultraääni ja magneettisuusmitatukset


* Weighing and Measuring, Checking Templates
* Dive Weighting

* The Nitric Acid Test: Nitric acid is powerful stuff and it will quickly dissolve other metals that are commonly alloyed with gold. Nitric acid dissolves any item that is not gold. However, 24K gold will be completely unaffected by nitric acid. Gold can only be dissolved by aqua regia (a mixture of concentrated nitric acid and hydrochloric acid).

* Magnetic Scale: The magnetic scale is a stationary fine scale with a strong magnet that precisely identifies magnetic differential weights of the weighed product. In other words, gold is not magnetic but common materials used for counterfeits such as tungsten, tantalum, rhenium, hafnium, iridium, steel and nickel are either paramagnetic or ferromagnetic.

* Ultrasound: Each metal has unique acoustic properties and sonic wave velocity

* Conductivity Test: The conductivity test has derived from material testing in aviation. Each metal and their alloys, just as the density, have a unique conductivity measured in MS/m.

* X-ray