What is Touchstone?

Stone is a piece of hard dark stone, such as jasper, slate or basalt, which is used in the process of testing to test metals. The use of such stones was once very widespread; Although they are less common today, the touch stones are still sometimes seen in testing offices and some people keep them as interesting curiosity. It is also possible to see examples of historical touch stones, some of which are relatively old, exhibited in museums.

You want to use a touch stone, someone would take a piece of tested metal and wipe it on a touchstone. The metals most commonly tested with the touch stone are silver and gold, because these metals are classically soft and have a high value that serves as motivation to be cheaper metals. Once a lane to be tested has been set, a "test pencil" of a known alloy to use the second lane for comparison is used.

In addition to comparing physical differences between stripes, Moassayers ST also uses acid solutions to dissolve noCleanliness in samples that can detect a trace of cheap metal alloys. Touch stones are usually stored by a range of test pencils and acids for testing and several companies continue to produce supplies for the use of touch stones.

It seems that the use of the touch stone was created in Greece around 500 BCE. The introduction of Touchstone has radically changed the Greek economic system into the Greek society and created a real value for the money created by allowing people to truly try cleanliness. As a result, the term "Touchnestone" began to gain wider consequences, so you can hear people who refer to the means of judgment or measure as a "touchstone".

You do not have to be interested in testing metals to be biased with a touch stone. Some scientific stores and mineralogy sell Touchstone -Rems that allow people to test their own samples. If such a set getsYou do not forget to oversee younger users, as the acid involved can be dangerous. It is also a good idea to store acids in a cold dry place outside the reach of curious children and pets.