nitric acid
The purer the gold, the stronger the acid required to dissolve it. Measured strengths of nitric acid are used to test for 14k and lower. Aqua regia, a mixture of one part nitric acid and three parts hydrochloric acid, is used to test higher karat purity through the process of comparison and elimination.

What is the most accurate test for gold?

The most accurate tests use X-ray fluorescence spectrometers (XRF). These machines, which can cost thousands of dollars, send X-rays through the tested item.

How accurate is acid testing for gold?

To top it off, acid testing isn’t always accurate. Most acid kits contain materials to test 10k, 14k, 18k,and 22k gold. The acid rounds to the nearest testing solution; it can’t tell you if it’s 13K or 18.5K. You have to trust that your employees will know all this and interpret the results correctly.

How can I tell if gold is real?

Drop the Item in Water Gently drop your gold item into the water. Real gold is a heavy metal and will not float, so if your gold item floats you know it is not real gold. Also, if you notice rust or tarnishing on the item after being in water, this is also a sign it is not real gold since gold doesn’t rust or tarnish.

What’s the best way to test for gold?

One of the most common, and most effective methods of testing if an item is gold, or not, is by using nitric acid . However, as you will see soon, this method is not infallible. As a very active gold buyer, I will concentrate only on the aspects of nitric acid as it relates to gold testing.

Which is the most accurate acid test for gold?

The acid test is also the cheapest method used to check gold. A simple acid test kit usually comes with a black touchstone and several acid solutions. You need to know how accurate is acid testing for gold for two reasons. First, because you want to figure out if gold is real and a false positive could sink you a lot of money.

Is there an acid test for 18k gold?

Most acid kits contain materials to test 10k, 14k, 18k, and 22k gold. The acid rounds to the nearest testing solution. It will not tell you if it’s 13k or 18.5k… Another problem with the acid test is that certain types of stainless steel may pass as 18 karat gold.

How to interpret nitric acid gold test results?

Nitric acid gold testing is just one indicator that an item may or may not be gold. What is important is to know how to interpret nitric acid test results. It is very easy to misinterpret nitric acid gold testing and end up buying something that is not gold. This article is about how to properly perform and interpret nitric acid gold test.