Tillie Doyle
Copper pans are a beautiful and functional addition to any kitchen. They work with all types of stovetops, including induction stoves, and can last for generations with proper care. If you're wondering whether your pan is made of copper, there are several tests you can perform. Firstly, examine the colour under good white light. Real copper has a reddish-brown hue, whereas brass items tend to have a yellowish tint. Another test involves using a magnet. Copper is not magnetic under ordinary circumstances, so if your pan attracts a magnet, it is likely lined with a different metal, such as stainless steel. You can also test the pan's conductivity with an ohmmeter if you have access to one. At room temperature, copper's resistance is 1.7 x 10^-8 ohm-meters. Finally, you can test the pan's material by rubbing it with a mix of salt and vinegar. If the area turns green after cleaning, you can be confident it's copper.
Characteristics of a Copper Pan
| Characteristics | Values |
|---|---|
| Thickness | Culinary grade copper pans are 1.5 – 3+mm thick. |
| Lining | Tin, stainless steel, nickel, or silver. |
| Colour | Real copper has a reddish-brown hue. |
| Magnetism | Copper is diamagnetic, so magnets repel it rather than attract it. |
| Conductivity | Copper has excellent heat conductivity. |
| Corrosion | Copper items may corrode or rust over time. |
| Durability | Copper pans are durable and can last for generations with proper care. |
| Safety | It is safe to cook with an unlined copper pan, but copper can leach into the food. |
| Cost | Lined copper pans are typically more expensive than unlined copper pans. |
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What You'll Learn
Check the pan's weight and thickness
Copper pans are a beautiful and functional addition to any kitchen. They conduct heat well, making cooking easier. Copper pans should feel heavy in your hand, and their thickness is the first consideration when determining authenticity.
A suitably thick copper pan will feel heavy in your hand. The thickness of the copper is the first consideration when determining authenticity. You want 2 to 2.5 mm of copper, which isn't easy to measure, but you can get a sense of it by feeling the weight of the pan. A thicker copper pan will be more durable and conduct heat more evenly.
Culinary-grade copper cookware is 1.5–3+ mm thick. Decorative copper cookware, on the other hand, has a copper wall thickness of less than 1 mm. Such items are cold-formed and cold-plated and would be destroyed in the molten tin retinning process required for culinary-grade wares.
If you have access to an ohmmeter, you can test your copper pan's conductivity. At room temperature, copper's resistance is 1.7 x 10^-8 ohm-meters. You can be sure that your item isn't pure copper if the resistance is much higher or lower than this.
Another way to check the thickness of your copper pan is to examine its colour under good white light. Real copper should have a reddish-brown hue, like a penny. Brass items, on the other hand, tend to have a yellowish tint. If your item is yellow, orange-yellow, or even has elements of grey, you are probably dealing with brass.
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Inspect for a reddish-brown hue
Inspecting for a reddish-brown hue is a great way to determine whether a pan is made of copper. The reddish-brown hue is a distinctive feature of pure copper, resembling the colour of a penny. This method of inspection is especially useful when distinguishing copper from brass, which tends to have a yellowish tint.
To perform this inspection, it is recommended to examine the pan under good white light. By observing the colour of the pan, you can make an initial assessment of its material composition. A yellowish, orange-yellow, or grey hue suggests the presence of brass, while a reddish-brown colour indicates copper.
It is important to note that the surface of the pan may provide valuable clues, but a more thorough assessment can be achieved by cleaning the pan first. By creating a mixture of salt and vinegar and applying it to the pan, you can wait for the cleaned area to oxidize. If the pan turns green, it is likely made of copper. This oxidation test can be a complementary method to the visual inspection, providing additional confidence in your determination.
Additionally, the thickness of the copper pan can be a factor in your inspection. Copper cookware with a thickness of 2 to 2.5 mm will have a substantial feel to it. A suitably thick copper pan will feel heavier in your hand. This tactile sensation, combined with the visual inspection, can provide further evidence of the pan's material composition.
While inspecting for the reddish-brown hue, you may also consider the presence of any linings or coatings on the pan. Copper pans with decorative linings, such as tin or stainless steel, may exhibit different visual characteristics. For example, a grey or silvery metal edge could indicate a hand-applied tin lining, while a solid copper rim might suggest a machined stainless steel or nickel lining. These additional clues can help you identify both the base material and any supplementary treatments or coatings.
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Listen for a certain sound when struck
Striking a copper item against something and listening to the sound is a traditional way of distinguishing copper from other metals. Copper has a unique, high-pitched ring when struck, which sets it apart from other metals. This method of testing the purity of a metal is called the "ring test" and has been used for centuries.
The ring test works because different metals have different densities and elastic properties, which cause them to vibrate at different frequencies when struck. The unique sound of copper is due to its high density and low elasticity.
It is important to note that this method may not be completely accurate, as some other metals, such as brass, can have a similar sound when struck. Therefore, it is recommended to use other tests in conjunction with the ring test to accurately determine if an item is made of copper.
One such test is to examine the colour of the item under good white light. Real copper should have a reddish-brown hue, similar to a penny. Brass items, on the other hand, tend to have a yellowish tint, ranging from yellow to orange-yellow, and may even have elements of grey.
Another scientific test that can be performed is to measure the electrical resistance of the item using an ohmmeter. At room temperature, copper has a resistance of 1.7 x 10^-8 ohm-meters, and a reading that is significantly higher or lower than this value indicates that the item is not pure copper.
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Test with a magnet
Copper pans are typically non-magnetic, but some newer designs include a conductive disc at the bottom, sandwiched within the copper itself. This makes them compatible with induction cooktops.
To determine whether your copper pan is lined with stainless steel, try the magnet test. Simply grab a magnet and place it against the bottom of the pan. If the magnet sticks, the pan is lined with stainless steel or iron. If the magnet does not stick, the pan is likely unlined copper.
It is worth noting that the magnet test is not a definitive method to determine whether a pan is copper or not. While copper is generally non-magnetic, it can sometimes be attracted to very strong magnets. Additionally, other metals that are commonly used in cookware, such as aluminium, are also non-magnetic.
Therefore, it is important to use the magnet test in conjunction with other methods to accurately determine whether a pan is made of copper. One such method is to examine the interior surface of the pan. Unlined copper pans will have a rougher, more textured surface, while lined copper pans will typically have a smooth, shiny, silvery, or stainless steel interior. Another method is to weigh the pan and compare it to a similar-sized unlined pan. Lined copper pans are usually heavier because the lining adds weight to the pan.
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Observe the rim
If you're trying to determine whether a pan is made of copper, one of the first things you should do is observe the rim. The rim of a copper pan can provide clues about the type of lining it has. If the rim is solid copper all the way around, it is most likely lined with machined stainless steel or nickel. On the other hand, if you notice grey or silvery metal on the top edge, it is likely hand-applied tin or possibly silver lining.
Tin-lined copper pans are typically lighter than stainless steel-lined pans, so weight can be a distinguishing factor. Additionally, you can use a magnet to test for stainless steel lining; if a magnet sticks to the rim, it is likely made of stainless steel.
It's important to note that copper pans with different linings have different properties. Tin-lined pans, for example, have excellent heat conductivity and are non-stick, but they cannot withstand high temperatures and are easily damaged by sharp objects. Stainless steel-lined copper pans, on the other hand, are more durable and can handle higher temperatures, but they may not conduct heat as effectively and can be sticky.
If you're dealing with a vintage or antique copper pan, it's crucial to inspect the rim for any damage. Over time, the tin lining can wear away, and sharp objects or metal utensils can cause further damage. If the damage penetrates the copper body, it may be necessary to consider relining or restoring the pan.
By observing the rim of a copper pan, you can gain valuable information about its lining and overall condition. This will help you determine if the pan is safe to use and make an informed decision about its suitability for your cooking needs.
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Frequently asked questions
Real copper has a reddish-brown hue, like a penny. If it's yellow, orange-yellow, or has elements of grey, it's probably brass. Striking your pan with something and listening to the sound can also help you distinguish between copper and brass. Brass will have a higher-pitched sound.
Tin-lined copper pans are typically lighter than stainless steel-lined copper pans. You can also use a magnet to determine if your pan is lined with stainless steel. If a magnet sticks to the pan, it is likely lined with stainless steel. If there is grey or silvery metal on the top edge, it likely has a hand-applied tin lining.
If you have any doubt about damage to a tin lining, you can test its integrity by wiping a bit of undiluted white vinegar on the wound and letting it evaporate at room temperature. If you see any verdigris flecks, you may need to get a new lining.
