Why Copper turns Black or Green? / Copper Tarnishing

Why Copper turns Black or Green? / Copper Tarnishing

Copper turns black or green

Copper is one of the good metal. It also acts as a mineral in the environment. But at some point, Copper is a reactive metal. Copper being an inevitable metal will turn into a black or green color. What could be the reason behind the change in color?

The reason behind the change in copper bottle/vessel color is due to “oxidization”. In the process of oxidation, copper reacts slowly in the presence of oxygen, resulting in copper oxide. It’s a chemical reaction that is completely natural. Thus, making your copper vessel/bottle layer oxide.

This process takes place when a copper bottle is left exposed to air and water. It leads to the formation of a thin, green layer on the surface of the metal. Acts as copper’s protective layer.  

This thin green substance is named copper carbonate or “green patina”. It does not affect the quality of metal. The oxidation process takes a gradual time to convert copper into a green patina. And before turning green, copper may turn into a black or brown color substance. 

Patina’s Symbolic

The patina is symbolic of a sign of age, which is highly prized as it raises copper metal value. Furthermore, protecting copper from other elements. The best example is of Statue of Liberty, which is of green coloration. But, from the actual fact, Lady Liberty is made of copper. It has formed a Patina formation with time. Exposure to air and water for a far longer time.

Due to this, many artists even treat copper surfaces/items with acetic acid to form copper acetate, also known as Verdigris. It is soluble and it only gives copper a green color coating. This is not as durable as a natural patina. Food items comprising the acetic compound are likely to induce instant corrosion when in contact with copper cookware. Food includes items like milk, wine, or vinegar, etc. The corrosion is Verdigris.

To a concern, this issue is more than just aesthetics. Where Copper tarnishing is just inevitable. Oxidation of copper will limit its heat conductivity. The copper vessel gets an effect. So, take proper care of your vessel. Or else clean it very well.

How to get rid of the Patina or Green layer?

The green patina so formed can be prevented by keeping your copper vessel/bottle/utensils into direct sunlight. Because of Oxygen, the formation of green patina takes place. Thus, preventing oxygen to come in contact with the copper metal will help you to stop the patina formation.

Another great way to get rid of patina is to clean your copper bottle with a solution of salt and vinegar, once a week. Be gentle, while washing the solution onto the vessel. Avoid harsh scrubbing. The patina on the surface of the item should be wiped off to avoid watermarks.

Circumstances Affecting Copper: How & Why?

  1. Oxygen – One of the most inevitable and natural types of tarnish happens in the presence of oxygen. Copper oxide formation takes place when copper and oxygen ions react. The process is very slow when comes to contact with dry air.
  2. Human Touch – The quickest way in which copper can tarnish is the human touch. The oil present in our skin is responsible for it. As copper is inevitable, there is a need for proper and regular cleaning of copper vessels and utensils.
  3. Moisture – Moisture catalysis the oxidation process. It enhances the reactivity of copper which leads to corrosion and patina formation. After that, wipe off all the water from the washed copper utensil or vessel. Instead of letting them dry on their own.
  4. Dust – Dust particle has the formation of dead skin cells and debris from both humans and pets. Tarnish happens more quickly as the debris contains a chemical that reacts with copper metal.

Some more circumstances include –

    1. Acidic Substances – The surface of copper easily reacts with acidic substances. This type of corrosion is highly soluble, which leads to the formation of toxic copper salt in the food. Subsequently, it is said not to use the copper vessels for acidic substances like milk, vinegar, or wine, etc.
    2. Heat and Chemical – Tarnishing of copper can happen with certain cleaning products and heat. Heat makes copper
  1. From ancient times, the benefits of drinking water from copper vessels have been mentioned in Ancient Indian texts. Over the centuries, copper has been used in various forms to treat illnesses including cuts, headaches, even varicose veins. In Ayurvedic, texts mention the use of copper vessels for drinking water. Copper is the only metal with anti-bacterial properties.

    According to Ayurveda, the benefits of drinking water from copper vessels has the ability to balance all the three doshas in your body, (Vata, Kapha, and pitta) and it does so by positively charging the water. The water stored in a copper vessel is known as ‘Tamara Jal’. It is supposed to be consumed after storing the water in a copper vessel for at least eight hours.

    When water is stored in a copper vessel the copper gently leaches into the water and lends it all its positive properties. The best part about this water is that it never becomes stale and can be stored this way for long periods of time.

    Benefit Of Drinking Water from Copper Bottle –

    1) Fights off Cancer –

    Copper has antioxidants. It fights off all the free radicals and negates their negative effects. Free-radicals and their harmful effects have been major causes of cancer in the human body.

    2) Protection from Harmful UV Rays –

    Copper also helps in the production of Melanin which gives color to one’s skin and eyes and also well protects one from the harmful UV rays of the sun.

    3) Aids the functioning of Thyroid Gland –

    According to the experts, the most common feature which lacks in thyroid patients is copper. Copper balances the inconsistencies of the thyroid gland. It also fights off the damaging effects of too much secretion from the thyroid gland.

    4) Balances Hypertension –

    Copper reduces cholesterol and triglyceride levels. If adults suffer from copper deficiency they develop hypertension. Therefore, trace amounts of copper are critical for the regulation of blood pressure in a person.

    5) Prevents Anemia –

    Copper assists in the breakdown of food to make hemoglobin, it helps the body in absorbing iron, the deficiency of which causes anemia. Copper deficiency in the human body can lead to rare hematological disorders. That can also result in low white blood cell.

    6) Cure Arthritis and Inflamed Joints –

    Copper has anti-inflammatory properties that provide great relief to patients suffering from arthritis and rheumatoid arthritis. copper has bone-strengthening properties, which makes it a perfect cure for arthritis.

    7) Helps in Digestion –

    Ayurveda claims that drinking “Tamra Jal” detoxifies and cleanses the stomach. Copper also has properties that stimulate peristalsis (rhythmic expansion and contraction of the stomach lining), reduces the inflammation of the stomach lining. It assists in better digestion. Copper is an excellent remedy for stomach ulcers, indigestion, and stomach infections.

    8) Increases Brain Efficiency –

    The human brain interacts with the rest of the body through electrical impulses. Copper helps the cells communicating with each other by carrying out these impulses. Thereby, making the brain work much efficiently.

    9) Helps Cardiovascular System –

    Copper helps clean plaque as well as dilate the blood vessels to increase the blood flow to the heart. Studies have proved that Copper deficiency can result in the dysfunction of the heart muscles. Leading to insufficient pumping of the blood, impaired circulation of blood in the body, and the inability to respond correctly to stress.

    10) Controls Ageing –

    Ancient Egyptians used a lot of copper-based beautifying agents, several skincare products these days are copper-based because copper is not only an antioxidant, it also assists cell regeneration, negating the harmful effects of free agents on the skin.

    11) Helps in Healing wounds –

    Copper exhibits anti-inflammatory, antibacterial, and antiviral properties. In addition, copper also assists skin regeneration and strengthens the immune system. Helping the body in healing wounds faster.

    12) Helps in Weight Loss –

    Copper plays an instrumental role in dissolving the excess fat deposits in the human body and helps reduce weight. Copper keeps the body in a fat-burning situation even when the individual is resting. However, this does not mean that too much copper will burn more fat.


    In conclusion, the benefits of drinking water from copper bottles are amazing. Copper is an essential mineral that acts as a natural remedy to boost your immunity and provides you an ample amount of health benefits. Daily consumption of water being stored in a copper bottle for 8-10 hours can do wonders.

    Therefore, Taal Mell provides you the purest form of copper bottles. It can help you store healthy living by sipping the purest form of water.From ancient times, the benefits of drinking water from copper vessels have been mentioned in Ancient Indian texts

    more reactive, while some products contain substances that react with copper. It is not recommended to place copper utensils in the dishwasher. However, to avoid such damages, clean them in more copper-friendly ways.


Since the discovery of copper, drinking water out of copper vessels is been practiced. If you properly follow the precautions then drinking water stored in a copper vessel can be a safe and healthy practice and you can prevent your copper from turning black or green. Though it will be based on the assumption that you are using quality copper vessels. In addition, it is also important to ensure that you do not store acidic substances in copper vessels.  

Copper tarnish is inevitable, but there are many easy ways you can clean it and prevent it. Make sure to clean your copper bottle regularly with proper care to enjoy the many health benefits of copper-infused water to the fullest potential. 

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