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Non-Destructive Platinum Testing with Hydrogen Peroxide: How to Identify Precious Metals

Testing for Platinum with Hydrogen Peroxide

Platinum is a precious metal with a wide range of uses, from jewelry to catalytic converters. However, it can be challenging to identify and test for.

Fortunately, hydrogen peroxide can be used as a non-destructive and accurate method of testing for platinum. In this article, we will discuss how hydrogen peroxide testing works and how to conduct the test.

We will also cover other indications and tests that can help identify platinum.

How Hydrogen Peroxide Testing Works

Hydrogen peroxide is a powerful oxidizing agent and can react with certain metals, including platinum. When hydrogen peroxide comes into contact with platinum, it produces bubbles in a chemical reaction.

This reaction is catalyzed by platinum, which speeds up the reaction and results in an effervescence of oxygen gas. Other precious metals like gold and silver do not have the same catalytic properties as platinum, so they will not produce the same result.

Conducting the Test

To conduct a hydrogen peroxide test for platinum, you will need a glass jar, hydrogen peroxide solution, and a small piece of the metal you want to test. Place the metal in the glass jar and add enough hydrogen peroxide to cover it.

Swirl the jar to ensure that the solution covers the metal completely. If the metal is platinum, you should see bubbles appearing on its surface.

The bubbling is a sign of the oxygen being released from the hydrogen peroxide and catalyzed by the platinum. If you observe the bubbles, the metal is highly likely to be platinum.

If you don’t witness any bubbling, the metal is not platinum. The test is simple and non-destructive, so you can safely test the same metal several times if needed.

Other Indications and Tests

While a hydrogen peroxide test is accurate, you may need to conduct additional tests to confirm that the metal is platinum. Some pieces of jewelry will have markings indicating the metal’s purity.

Platinum is typically marked with “PLAT,” “950 PLAT,” or “PT,” indicating that the jewelry is made of 95% pure platinum. Alternatively, you can perform a torch test, which involves heating the metal with a torch.

Platinum has a high melting point, so it will stay solid and glow red hot due to the heat. Silver, on the other hand, has a lower melting point and will become shiny within seconds of heating.

Another way to identify platinum is by its density. Platinum has a high density, so it will weigh more than other metals of similar size.

Safety Precautions

While hydrogen peroxide is a relatively safe chemical, there are some precautions you should take when handling it. At higher concentrations, hydrogen peroxide can be dangerous and cause chemical burns or blindness if it comes into contact with your skin or eyes.

Never mix hydrogen peroxide with other chemicals, as this can cause dangerous reactions. Instead, use hydrogen peroxide and other chemicals separately.

It’s also essential to be cautious about igniting hydrogen peroxide, as it releases oxygen as it decomposes. If the concentration is sufficient, it can ignite spontaneously and create a fierce flame.

If you need to work with higher concentrations of hydrogen peroxide, make sure to do it outdoors or in a well-ventilated area.


Testing for platinum with hydrogen peroxide is a simple and non-destructive method that can give accurate results. If you observe bubbles in the hydrogen peroxide solution, you can be confident that the metal is platinum.

However, it’s essential to follow safety precautions when handling hydrogen peroxide, particularly at higher concentrations. If you’re unsure whether a metal is platinum, you can also use jewelry markings, a torch test, or density to confirm it.

Identifying Metals

Metal identification is essential for different fields, from manufacturing to jewelry-making. Different metals have distinct properties, such as color, weight, and malleability, making them unique.

Many tests can identify metals, including acid tests, density measurements, and visual inspections. However, each test has its limitations and may not be suitable for all metals.

In this article, we will discuss the limitations of different metal identification tests and how to test for silver using acid tests. We will also cover how to measure density and specific gravity as an alternative method for identifying precious metals.

The Limitations of Different Tests for Metal Identification

Acid tests are one method of identifying metals, but they have drawbacks. Acid tests are often destructive, meaning that they require a small amount of the metal to be ground and dissolved before being applied to the acid solution.

This can damage the item being tested, making it unsuitable for jewelry or other valuable artifacts. Additionally, acid tests are only suitable for testing metals that are reactive to acids.

Another method of identifying metals is using a magnet. Ferrous metals like iron and steel will attract to magnets, making them easy to identify.

However, many other metals, especially precious metals, are not magnetic and require additional tests.

Testing for Silver

Silver is a common precious metal used in jewelry and other applications. There are several ways to test for silver.

One of the most popular methods is using an acid test. An acid test involves applying acid to the surface of the metal and observing the reaction.

To test for silver using an acid test, you need to obtain a testing solution called nitric acid. You should then add equal amounts of distilled water to the nitric acid, resulting in a 50/50 mixture.

Next, you should move the acid solution to a glass container or a ceramic plate and then place a drop of the acid on the metal to be tested. If the metal is silver, the drop will turn white and have a pearling effect.

The pearling effect means that the drop remains small and round, rather than spreading out. If the metal is not silver, the drop will turn brown and may spread out.

It’s important to wear gloves and protective equipment when conducting acid tests, as nitric acid is a corrosive and potentially dangerous substance.

Using Density Measurements

Density measurements are another method for identifying metals, particularly precious metals like gold and silver. Measuring density involves measuring the volume of the metal and then dividing it by its mass.

To measure density, you’ll need to obtain a graduated cylinder, which will help you measure the volume of a metal. You will also need a set of stones with known specific gravity, which you can use to compare and identify the metal being tested.

For instance, if you’re testing gold, you need to compare its density against a set of gold stones. To conduct the test, first, fill the graduated cylinder with water and then note down the water level.

Add the metal to the cylinder, and then record the new water level. Subtract the original water level from the new water level.

This difference is the volume of the metal. Calculate the mass of the metal and then divide the volume by the mass to get the specific gravity.

Compare the specific gravity to the known specific gravities of metal to identify the metal you are testing.


Choosing the right method for identifying metals is essential, as different tests have varying limitations and requirements. Acid tests are suitable for identifying reactant metals and may be destructive.

On the other hand, density measurements offer a non-destructive way to identify precious metals. However, this method requires additional tools and materials.

For a simple and non-destructive approach, hydrogen peroxide testing is an effective method for identifying platinum. Aside from its accuracy, it’s also safe and easy to perform.

In conclusion, identifying metals is a crucial aspect of many fields, from manufacturing to jewelry-making. Different tests offer different levels of accuracy, and each has its limitations and requirements.

When identifying metals, consider the test’s simplicity, accuracy, and safety, and choose accordingly. Whether using acid tests, density measurements, or hydrogen peroxide testing, identifying metals ensures their value and quality.


Q: Can I use a magnet to identify all metals? A: No, only ferrous metals like iron and steel attract to magnets.

Q: Is nitric acid safe to use for testing metals? A: No, nitric acid is a corrosive and potentially dangerous substance.

You must wear gloves and protective equipment and use it with caution. Q: What metals can be identified using an acid test?

A: Acid tests are suitable for testing metals that are reactive to acids, such as silver and gold. Q: Can density measurements be used to identify non-precious metals?

A: Yes, density measurements are a suitable way to identify any metal with a specific gravity that can be compared to known specific gravities. Q: Is hydrogen peroxide testing safe?

A: Yes, hydrogen peroxide testing is safe and does not require damaging the item being tested.

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