Tamra Jal is the Sanskrit term for copper water: water left to rest in a copper vessel for 6 to 8 hours, traditionally overnight, and drunk in the morning as an Ayurvedic ritual.

How much copper water is safe to drink?

One to two bottles a day is a sensible amount. The WHO guideline for copper in drinking water is 2 mg per litre, and water stored in copper for a few hours stays well below this. People with Wilson's disease should avoid copper water.

How long can I store water in a copper bottle?

Up to about a day is ideal; overnight for 6 to 8 hours is the classic tamra jal practice. Empty, rinse, and dry between fills.

The Copper Water Guide

Everything you need to know about copper water — from safe use and care to copper science, craftsmanship and quality.

EXPOLRE THE GUIDE

Aroveda Stories · Care Guide

Copper ages. That's how you know it's real.

Everything there is to know about copper water — what it is, the tradition and science behind it, how to use it safely, and how to clean and care for your bottle so it lasts a lifetime.

Pure, unlined copper. Handcrafted in India.

The Basics

What is copper water?

Copper water is drinking water that has been stored in a pure copper vessel long enough for a tiny, controlled amount of copper to dissolve into it.

When water sits in an unlined copper bottle for several hours, a very small quantity of copper ions migrates naturally into the water. The result is mineral-touched water with a characteristically smooth, soft taste — and a practice households across India have followed for generations.

Because Aroveda bottles are made from 99.96% pure, unlined and unlacquered copper, nothing stands between the metal and your water. What you pour is exactly what the copper gives it, and nothing else.

The Tradition

What is Tamra Jal?

Tamra Jal (ताम्र जल) is the Sanskrit name for “copper water” — water that has rested in a copper vessel, traditionally overnight.

In Ayurveda, water is poured into a clean copper vessel in the evening and left to stand for 6–8 hours. By morning it has become Tamra Jal, sipped on an empty stomach as part of a daily wellness ritual.

Ayurvedic texts describe Tamra Jal as helping to balance the body's three doshas — vata, pitta and kapha. However you view the tradition, the ritual is a simple, mindful way to begin the day with clean, copper-touched water.

From the Ayurvedic tradition

Storing water the way it was meant to be stored

In Ayurveda, water rested overnight in a pure copper vessel is called tamra jal — copper water. Fill your bottle before bed, let it sit 6–8 hours, and drink it first thing in the morning. Because Aroveda copper is unlined and unlacquered, nothing sits between the metal and your water.

Tamra Jalताम्र जल · copper water

A Long History

Why copper has been traditionally used

Long before modern water bottles, copper was the material of choice for storing and carrying water — in India, Egypt and across the ancient world.

In the Indian household, the copper lota and matka were everyday objects, valued because water kept in them stayed fresh and tasted clean. Ayurveda formalised the practice, recommending copper vessels for daily use. Three qualities kept copper in use for thousands of years:

Studied for its antimicrobial properties

Copper's oligodynamic effect helps keep stored water clean over several hours.

Ayurvedic tradition

Water stored overnight becomes tamra jal, prized in Ayurveda for daily wellness.

Plastic-free

One handcrafted bottle replaces hundreds of single-use plastic ones.

Built to last

99.96% pure, unlined copper can be renewed again and again — a lifetime bottle.

The Evidence

Copper water science

The tradition has a basis in science, too. Copper is naturally antimicrobial — an effect researchers call the oligodynamic effect.

Laboratory studies have found that storing water in copper vessels for several hours can significantly reduce common waterborne bacteria such as E. coli and other contaminants. The small amount of copper ions that dissolve into the water is what makes this possible.

Copper is also an essential trace mineral — your body needs small amounts of it for healthy connective tissue, iron absorption and normal enzyme function. Copper water offers a gentle, natural source.

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Oligodynamic effect

Copper ions disrupt many bacteria, helping keep stored water cleaner.

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Essential mineral

Copper supports iron absorption, enzymes and connective tissue.

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Softer taste

Many people find copper-stored water tastes noticeably smoother.

Use It Right

Safe use

Copper is beneficial in the right amount — and like any mineral, it's about balance.

Store only plain, room-temperature water, and let it sit for 6–8 hours (overnight is ideal). There's no benefit to leaving water for days — empty, rinse and refill instead.

Aim for one to two bottles of copper water a day rather than drinking from it constantly. The World Health Organization's guideline for copper in drinking water is 2 mg per litre; water stored in copper for a few hours typically stays well below this.

Good to know

People with Wilson's disease or any condition affecting copper metabolism should avoid copper water. Never store acidic or carbonated drinks (citrus, soda, buttermilk) in copper, as they react with the metal. If you are pregnant or managing a health condition, check with your doctor first.

Copper's Life

Watch how copper changes — and comes back

Slide through the life of your bottle. Every stage is normal, and every stage is reversible with a natural clean. Drag to see how pure copper ages between washes.

Freshly polished

Days since last clean

Day 0~2 weeksMonths

Polished

Bright, rose-gold and faintly reflective. This is copper fresh from a clean — exactly how it should look after your weekly ritual.

The Cleaning Ritual

How to clean a copper water bottle

Copper responds to mild acid and gentle friction — the same ingredients used for generations. Never use commercial metal polish on the inside; anything you clean with touches your drinking water. Pick a method, then rinse well and dry completely.

Best for a quick weekly shine

Lemon & Salt

The fastest everyday method — the citric acid dissolves tarnish while the salt gently scrubs.

Halve a lemon and dip the cut face in coarse salt.
Rub over the outside in small circles; the shine returns as you go.
For the inside, add salt + lemon juice and swirl with the included brush.
Rinse thoroughly with warm water and dry with a soft cloth.

The traditional Indian way

Tamarind (Imli)

A time-honoured kitchen method — tamarind's natural acids lift tarnish beautifully, inside and out.

Soak a lump of tamarind in a little warm water to make a paste.
Coat the copper, inside and out, and let it sit 2–3 minutes.
Scrub gently with the brush or a soft cloth.
Rinse until the water runs clear, then dry fully.

For stubborn dark spots

Vinegar & Flour

A paste that clings to heavy tarnish — reach for this when a bottle has been neglected for a while.

Mix 1 tbsp salt + 1 tbsp flour + enough white vinegar for a paste.
Spread over the tarnished areas and leave for 10 minutes.
Buff off with a soft cloth — the paste lifts the oxide.
Rinse well and dry with a lint-free towel.

A Simple Routine

How often to do what

After each use

Rinse with plain water and air-dry with the cap off. Don't store water inside for more than a day at a time.

Weekly

Give it a natural clean — lemon & salt or tamarind — to keep the interior bright and the copper active.

Monthly

Deep clean with the vinegar-flour paste if tarnish has built up, and check the seal and threads for grit.

Always

Dry completely before storing. Trapped moisture is the single biggest cause of heavy tarnish and water spots.

Keep It Pure

Do & don't

Do

Clean with natural acids — lemon, tamarind, or vinegar.
Use the included soft brush for the narrow neck.
Hand wash and dry with a soft, lint-free cloth.
Store empty and dry with the cap loosely on.
Fill with plain, room-temperature water for storing.

Don't

Never put copper in the dishwasher — heat and detergent ruin it.
Skip steel wool and abrasive scourers — they scratch the surface.
Avoid bleach and harsh chemical cleaners.
Don't store acidic or fizzy drinks (citrus, soda) inside.
Don't leave very hot liquids or boil water in the bottle.

Everyday & Travel

Storing and carrying it well

Between uses

Keep it dry and uncapped in a cool spot. A little airflow prevents the trapped moisture that causes tarnish.

On the go

Carry it in the jute bag to protect the finish from scratches, and empty it before long storage.

Long breaks

Not using it for a while? Clean, dry fully, and store empty with the cap loose — a quick rinse revives it.

Quick Fixes

Troubleshooting copper

Every one of these is common and fixable — here's what's happening and what to do.

What you see	What it means	What to do
Brown or black inside	Normal oxidation from water and air.	Clean with lemon & salt; it lifts off in minutes.
Green spots (patina)	Verdigris — harmless outside, best removed inside.	Rub with lemon & salt until the copper shows again.
Water tastes metallic	Water stored too long or acidic drink used.	Empty, clean, and store plain water for under a day.
Dull, patchy finish	Uneven tarnish or leftover cleaning residue.	Do a full lemon-salt clean, rinse well, dry completely.
White water spots outside	Hard-water mineral marks after drying.	Wipe with a cloth dampened in a little vinegar, then buff.

Good to Know

Copper care FAQ

Is the dark tarnish inside safe to drink from?

Dark tarnish is copper oxide — the normal result of copper meeting air and water, and a sign your bottle is real, uncoated copper. It isn’t a defect, but it’s best not to let it build up. Clean it off weekly with lemon and salt for the freshest taste, and always clean away any green or blue deposits inside before drinking.

How do I clean a copper water bottle naturally?

Use a natural acid and gentle friction: lemon and salt for a weekly shine, tamarind for a traditional deep clean, or a vinegar-flour paste for stubborn spots. Rinse thoroughly and dry completely afterwards.

Why can't I use soap or the dishwasher?

Dish soap leaves a film, and dishwasher heat plus harsh detergent will strip and pit the copper, dulling it permanently. Natural acids clean just as well and leave nothing behind in your water.

My bottle turned green in one spot. Is that a problem?

That's patina (verdigris). Outside it's purely cosmetic and some people prize it. On any surface that touches your water, simply clean it away with lemon and salt — a minute of rubbing removes it entirely.

How long can I keep water stored inside?

Up to about a day is ideal; overnight (6–8 hours) is the classic tamra jal practice. Empty, rinse, and dry between fills rather than topping up over many days.

Can I put lemon water, juice, or fizzy drinks in it?

Only plain water for storage. Highly acidic or carbonated drinks react with bare copper and can leach too much metal, plus they leave heavy tarnish. Use lemon for cleaning, not for storing.

Made By Hand

Craftsmanship

Every Aroveda bottle is handmade in Moradabad — India's centuries-old centre of copper and brass craft, known as Peetal Nagri, the City of Metal.

Skilled artisans shape each bottle from pure copper, hand-hammering, joining and finishing it the traditional way. Because the work is done by hand, no two bottles are exactly alike — small variations are the signature of real craft, not a flaw.

There's no lining, no lacquer and no mixed metal — just solid, unalloyed copper, worked the way it has been for generations.

Moradabad

Handcrafted by traditional artisans

Hand-hammered

Shaped and finished by hand, one at a time

Unlined

No lacquer, no coating, no mixed metal

Proven Purity

Quality & testing

Purity you can verify. Not every “copper” bottle is what it claims — many use lacquer coatings or mixed metals that defeat the purpose.

Aroveda copper is independently tested, so you know exactly what you're drinking from.

99.96% pure copper, confirmed 99.96% pure copper (material test report available on request)by third-party SGS lab testing.
BIS certified for quality and safety.
No lacquer or internal coating — bare, food-safe copper.
BIS licence CM/L 8700185822 under IS 17803:2022 before it ships.

Drink pure. Be sure.

Handcrafted in Moradabad · 99.96% pure, unlined copper

Shop the copper bottle

Buying guide

Questions buyers actually ask

Short, factual answers — with sources — so you can judge any copper bottle, including ours.

How can I identify a solid copper bottle?

Look inside, not outside. Solid copper shows the same reddish-gold metal on the inside wall, the neck threads and the base — with no silver, grey or glossy coating anywhere water touches.

Check the interior. Shine a light inside. Bare copper looks matte rose-gold to brown. A silver or uniformly shiny interior means a steel liner or a lacquer coat.
Watch it tarnish. Real, uncoated copper darkens within days of holding water and brightens again in seconds with lemon and salt. A bottle that never changes colour is almost certainly coated.
Inspect the joints. Seams should be clean, smooth and the same colour as the body — not a grey bead of filler metal.
Use a magnet — with care. Copper isn't magnetic, so a magnet that sticks reveals steel. Brass and aluminium aren't magnetic either, so a non-stick result alone doesn't prove copper.
Ask for paperwork. A real maker can show a material composition report and a heavy-metal leaching test from an independent lab.

Our hammered 950 ml bottle is bare copper inside and out, so you can run every one of these checks yourself.

What does copper purity mean?

Purity is the percentage of the metal, by weight, that is copper. 99.9%+ is commercially pure copper; the remaining fraction is trace elements left from refining.

Pure copper vs. alloys. Brass (copper + zinc) and bronze (copper + tin) can look similar but are different metals. They should not be sold as “pure copper.”
Why it matters. High purity means fewer unknown elements in contact with your water and predictable cleaning and ageing behaviour.
What purity doesn't tell you. A purity figure describes the sheet metal only — not the filler used in joints, the cap, or any coating. That is why a leaching test on the finished bottle, measuring what actually ends up in the water, matters as much as the purity number.

Aroveda bottles are made from 99.96% pure copper, per our material test report.

How do I clean and maintain a copper bottle?

Rinse after every use, dry fully with the cap off, and clean weekly with a mild natural acid (lemon, tamarind or vinegar) plus salt. No dishwasher, no steel wool, no chemical polish inside.

When	What to do
After each use	Rinse with plain water; air-dry with the cap off.
Weekly	Lemon juice + salt inside; swirl and scrub with a narrow brush, then rinse well.
Heavy tarnish	Salt + flour + white vinegar paste for 10 minutes, then buff and rinse.
Always	Rinse away every trace of cleaning acid before refilling — acid left behind increases how much copper dissolves into water.⁵

Darkening is normal oxidation, not damage. Every Aroveda bottle ships with a narrow cleaning brush sized for the neck.

See our bottles →

What should I know about copper exposure and safe use?

Copper is an essential nutrient, but more is not better. Store only plain water, keep storage to about a day, and stay well under recognised limits. Some people should not use copper vessels at all.

The reference numbers

Daily need: 0.9 mg of copper for adults.¹
Daily upper limit: 10 mg from all sources combined — food, drinks and supplements.¹
Drinking-water limits: WHO guideline 2 mg per litre;² US EPA action level 1.3 mg per litre.³

What a copper vessel adds. In a peer-reviewed study, water stored in copper pots for 16 hours contained about 0.18 mg of copper per litre — well within WHO limits.⁴ At that level, two litres a day adds roughly 0.35 mg, a small fraction of the 10 mg upper limit. Results vary: acidic water, warm water and longer storage all increase how much copper dissolves.⁵

Use it this way

Plain, room-temperature water only — never juice, lemon water, soda, milk-based or hot drinks.
Store 6–8 hours (overnight); empty and refresh within a day.
If you take a copper supplement, count it toward the 10 mg limit.

Don't use copper vessels, or ask a doctor first, if:

You have Wilson disease or any disorder of copper metabolism.⁶
The water is for infants or for preparing infant formula.⁷
You are pregnant, have liver or kidney disease, or are managing another health condition.

Nausea, stomach upset or a strong metallic taste are signs to stop, clean the bottle and shorten storage time.⁸

What is the difference between lined and unlined copper bottles?

In an unlined bottle, water touches copper. In a lined bottle, a stainless-steel or coated inner wall keeps water away from copper — effectively a steel or coated bottle with a copper exterior.

	Unlined (bare copper)	Lined / coated inside
Water touches copper?	Yes	No
Traditional tamra jal?	Yes	No
Suitable drinks	Plain water only	Usually any drink (check maker)
Interior care	Weekly natural clean	Ordinary washing
Interior tarnishes?	Yes — normal and reversible	No

Watch for the in-between case: clear lacquer sprayed inside to stop tarnish. It blocks contact with copper and can wear unevenly. If a “pure copper” bottle never tarnishes inside, ask whether it's lacquered.

All Aroveda bottles are unlined. The enamel dots on our Aqua and Green bottles are decorative and on the outside only; the interior is bare copper.

What should I check before buying a copper bottle?

Confirm the metal, the interior, the joints and the paperwork — then make sure you can clean it.

Material stated as a number — “99.9%+ pure copper,” not just “copper” or “copper-finish.”
Unlined, uncoated interior — if copper water is the reason you're buying.
Leaching test on the finished bottle for lead and cadmium from an independent, accredited lab. This is the single most useful document a seller can give you.
Clean seams and a sound seal — smooth, same-colour joints and a food-grade silicone seal that doesn't leak.
A neck you can clean — check that a brush is included or the opening is wide enough.
Recognised certification. In India, copper drinking bottles fall under IS 17803:2022, and a BIS licence number on the product can be verified in the BIS Care app.⁹
Clear safe-use instructions — a responsible seller tells you what not to store and who shouldn't use copper.