Real copper has a pinkish-red colour, is not attracted to a magnet, is noticeably heavier than a fake of the same size, and stays copper-coloured when scratched instead of showing grey metal underneath. No single test is enough on its own. The most common mistake is trusting the magnet test, because brass and stainless steel are not magnetic either.
We have been hand-hammering copper in our workshop in Kahramanmaraş, Turkey, for around 40 years. Many items brought to us as "solid copper" turn out to be brass or copper-plated steel. Below are the checks we run at the bench, in an order you can repeat at home or when inspecting a supplier's sample.
The 5-minute test: do it in this order
- Magnet test: Hold a fridge magnet to the body, base and handles separately. If it sticks, the core is steel or iron with a copper coating. If it does not stick, nothing is proven yet; move on.
- Colour test: Compare the item in daylight with a piece you know is real copper. Copper is pinkish-red; brass is clearly yellow, close to gold.
- Edge and scratch test: Look at a hidden corner of the base or the rolled rim. Plated items show grey or silver metal where the coating has worn. On solid copper, a scratch stays copper-coloured.
- Weight test: Copper has a density of 8.96 g/cm³, heavier than steel or aluminium. Use the table below.
- Sound test: Tap it with a fingernail. Thick copper gives a short, solid sound; thin sheet rings high and long. This tells you about thickness, not authenticity.
An item that passes the first four tests is very likely real copper. For certainty, metal workshops and jewellers use an XRF analyser. Do not use acid tests at home; they damage the piece and are not safe.
Weight table: the strongest evidence in your hand
If a supplier does not state the gauge, ask for the weight. Approximate values for a 30 cm (11.8 in) round copper tray with a 3 cm rim, calculated from copper's density, handles excluded:
| Sheet thickness | Approx. weight (30 cm tray) |
|---|---|
| 0.5 mm | 450–500 g |
| 0.8 mm | 700–750 g |
| 1.0 mm | about 900 g |
An item well below these weights at the same size is either very thin or not copper.A solid copper water jug is noticeably heavier than a plated one of the same size
Real copper vs brass vs copper-plated steel
| Check | Solid copper | Brass | Copper-plated steel |
|---|---|---|---|
| Colour | Pinkish-red | Yellow, gold-like | Copper-coloured, grey where worn |
| Magnet | Does not stick | Does not stick | Sticks |
| Scratch | Stays copper-coloured | Stays yellow | Shows grey metal |
| Over time | Darkens; greenish patina over years | Darkens more slowly to brown | Coating peels and stains |
| Price | Highest | Lower | Lowest |
How to check copper cookware: pans, pots and coffee pots
- Lining: Cookware should be tin-lined inside. Good tin is matte, light silver and even. Dark grey, lead-coloured tin may not be pure; ask the supplier.
- Base thickness: A thin base lets heat pass straight through and burns food over the flame. Press the base; it should not flex.
- Hammer marks: On hand-hammered pieces, the marks vary slightly in size and depth. A perfectly repeating pattern is pressed or machine-made.
- Handles: Riveted or welded firmly; they should not move when you shake the piece.
Our tin-lined cookware is in our copper pans and skillets and Turkish copper coffee pots collections.
3 questions to ask any copper supplier
- What is the sheet thickness in mm?
- What is the copper purity?
- Is the inside tin-lined, and is the tin pure?
A real producer answers these without hesitation. If the answers do not come, there is a middleman in between or nobody knows the product. In our workshop the sheet is 99.9% pure copper and is checked before cutting; poor sheet cracks under the hammer and gives itself away. Importers, hotels and retailers can request a sample before a bulk order: samples are invoiced at retail price and the difference is credited against a wholesale order. Compare the gauges and weights on our copper trays and copper mugs product pages.
Frequently asked questions
How can you tell if copper is real?
Real copper is pinkish-red, not magnetic, heavier than a fake of the same size, and shows no grey metal when scratched. Use the tests together; a magnet test alone is not enough.
Does a magnet stick to copper?
No. Copper is not attracted to magnets. Brass, aluminium and stainless steel are not either, so the test only catches copper-plated steel.
How do you tell copper from brass?
By colour. Copper is pinkish-red, brass is yellow and gold-like. Neither is magnetic, so the magnet test does not separate them.
Does real copper tarnish?
Yes. Copper darkens in air and forms a greenish patina over years. This is a natural sign of real copper, not damage.
Why is the inside of my copper pan silver?
Because it is tin-lined. Food-contact surfaces of copper cookware are coated with tin; the outside stays copper-coloured.