Green hair is caused by copper deposits that bond to your hair fiber, and removing them requires breaking that bond with an acidic or chelating solution. The good news: most cases can be fixed at home in a single treatment. The approach you choose depends on how deep the discoloration is and whether your hair is already damaged from bleaching or chemical treatments.
Why Your Hair Turned Green
The culprit isn’t chlorine, despite what most people assume. It’s copper. When dissolved copper in water comes into contact with your hair, it forms insoluble deposits that bind to the hair’s inner structure. Swimming pools are the most common source because many pool algaecides use copper sulfate as the active ingredient. As pool water evaporates and gets topped off over a season, copper concentrations build up.
But pools aren’t the only source. Copper plumbing in your home can leach the metal into tap water, especially when water sits in the pipes for several hours overnight or when the water’s pH drops low enough to dissolve copper and brass fittings. Concentrations above 0.3 parts per million are enough to cause discoloration. Running your faucet for one to five minutes before showering can flush out some of this buildup.
Blonde, bleached, and chemically treated hair is far more vulnerable. Bleaching and perming damage the outer protective layer of the hair shaft, which increases the number of negatively charged binding sites in the hair protein. Copper ions latch onto those sites readily. Under an electron microscope, heavily affected hair shows a complete loss of its outer protective layer, with tiny pits scattered across the surface. This is why two people can swim in the same pool and only the one with lighter or processed hair walks out with a green tint.
The Fastest Fix: Chelating Shampoo
A chelating shampoo is the most reliable option. These shampoos contain ingredients that chemically grab onto metal ions and pull them off the hair so they rinse away with water. Look for tetrasodium EDTA, disodium EDTA, or sodium phytate on the ingredient list. These are the active chelating agents that do the heavy lifting.
Use the shampoo on dry or barely damp hair for maximum contact with the deposits. Lather it in, let it sit for five to ten minutes, then rinse thoroughly and follow with a deep conditioner. One or two washes usually clears a mild green tint. Heavier discoloration may need a few sessions spread across a week. Chelating shampoos are stronger than regular clarifying shampoos, so limit use to when you actually need mineral removal rather than making them part of your daily routine.
Home Remedies That Actually Work
If you don’t have a chelating shampoo on hand, several pantry items can break down copper deposits because they’re acidic. Copper bonds weaken in acidic environments, which is why most effective DIY treatments share one thing in common: a low pH.
Aspirin Soak
Crush about eight aspirin tablets in a bowl and dissolve them in warm water. The active ingredient is a mild acid that helps loosen mineral deposits. Work the mixture through your hair, let it sit for about 15 minutes, then rinse with clean water and shampoo and condition as normal.
Tomato-Based Products
Ketchup and tomato paste are mildly acidic and contain compounds that can help strip copper. Coat your hair generously, leave it on for 15 to 20 minutes, then rinse. It’s messy but surprisingly effective for moderate cases. The red pigment won’t stain your hair.
Carbonated Beverages
Club soda and cola both contain phosphoric or carbonic acid, which helps dissolve copper. Pour it over your hair, let it fizz for a few minutes, then rinse and wash. This works best as a quick fix for a faint tint rather than deep discoloration.
Lemon Juice or Apple Cider Vinegar
Mix equal parts lemon juice (or apple cider vinegar) and water, apply it to the affected areas, and leave it on for five to ten minutes before rinsing. Both are acidic enough to help lift copper deposits without being harsh. Follow with conditioner, since acid treatments can leave hair feeling dry.
Be Careful With Baking Soda
Baking soda appears in many DIY recommendations, but it comes with real risks, especially for hair that’s already compromised. Its pH sits between 8 and 9, which is alkaline enough to pry open the hair’s outer protective layer. When that layer opens, water penetrates the shaft and breaks down the internal bonds that give hair its elasticity. The result is increased friction, static, and breakage.
If your hair is already bleached, permed, or color-treated (which is likely, given that damaged hair turns green more easily), baking soda can make things worse. If you do use it, dissolve a small amount in water rather than applying it as a paste, keep contact time short, and always follow with a deep conditioner. But the acidic options above are generally safer and more effective for this specific problem.
How to Keep It From Coming Back
Once you’ve cleared the green, prevention is straightforward. Wet your hair thoroughly with clean, non-pool water before swimming. Hair acts like a sponge: if it’s already saturated with fresh water, it absorbs significantly less pool water. Applying a leave-in conditioner before getting in the pool adds another barrier by coating the hair shaft and reducing direct contact with dissolved copper.
A swim cap is the most effective option for frequent swimmers, especially those with bleached or light-colored hair. It won’t keep every drop of water out, but it blocks the prolonged soaking that leads to heavy copper absorption.
Rinsing your hair immediately after swimming matters more than most people realize. The longer pool water sits in your hair as it dries, the more time copper has to bond. A quick rinse under a shower right after you get out of the pool removes most of the dissolved minerals before they can set. If you swim regularly, using a clarifying shampoo once a week helps prevent gradual buildup that turns into a visible tint over time.
For copper coming from your home’s plumbing rather than a pool, the fix is simpler. Let the cold water run for a minute or two before you shower, particularly first thing in the morning or after being away from home for hours. This flushes out the water that’s been sitting in contact with copper pipes. If discoloration persists, a shower-head filter designed to remove heavy metals can reduce copper levels at the point of use.