Why does my hair turn green at the pool?

Do you notice pool green hair after swimming? Discover why this phenomenon occurs and how to avoid it. This article is for everyone who wants to understand and prevent the appearance of green hair after swimming, especially those with blonde or highlighted hair. It is important to address this topic because green highlights can alter the beauty and health of the hair, cause frustration, and require specific care to restore vibrant color.

Definition of copper sulfates

Copper sulfates are chemical agents used in swimming pools to combat algae, but they can also cause green reflections in hair. Their presence in the water aims to prevent the proliferation of algae, but these substances react with the hair fiber, causing discoloration and the appearance of a greenish tint, a common problem after swimming.

Why does hair turn green?

The phenomenon of green hair after swimming is explained by a chemical reaction between certain agents present in the water and the hair fiber. The main culprits are chlorine and copper ions, particularly from copper sulfates used to combat algae in swimming pools. When these substances come into contact with hair, they can bind to the fiber, especially if it is porous or damaged, and cause a color change, resulting in green highlights.

Blond hair, whether highlighted or bleached, is particularly fragile when exposed to external aggressors, especially chlorine and copper ions in water. This fragility towards UV rays, salt, and chlorine is exacerbated during the summer. Exposure to seawater, rich in sea salt, intensifies the drying out and crystallization of the hair fiber, dulling the hair, especially blond hair.

The chlorine, used to disinfect pool water, has a dehydrating and weakening effect on the hair fiber, leading to loss of shine, dryness, and increased vulnerability. Copper ions, often present in swimming pool water due to anti-algae treatments or equipment corrosion, react on direct contact with hair, promoting metal fixation on the fiber and causing the appearance of a greenish hue.

In short, the hair’s porosity, combined with the lack of a protective barrier and repeated exposure to pool water, promotes the absorption of the chemicals responsible for green tones. Blonde hair is therefore more vulnerable and requires special care, including moisturizing, nourishing, and anti-yellowing treatments, to preserve its health and color after exposure to the ocean or a swimming pool.

Who is affected by green hair?

All hair types can be affected, but blond hair and highlighted hair are more likely to turn green due to their more fragile structure and lower pigment content. This fragility makes them more vulnerable to oxidation caused by certain agents present in pool water.

Safety precautions before swimming

To limit the appearance of green hair, it is essential to adopt preventive measures before swimming:

• Wet your hair with clear water: this creates a barrier that reduces the absorption of chlorine by the hair fiber.
• Apply a hydrophobic protective treatment (leave-in conditioner, hair mask, or light vegetable oil) to strengthen this barrier.
• Wear a silicone swimming cap, the best barrier against direct contact with chlorinated water.
• Protect your hair from UV rays and the sun during outdoor activities.

After-swim care

After swimming, it’s essential to follow a proper routine to maintain the health and color of your hair:

• Rinse your hair immediately with clean water to remove any chlorine residue.
• Wash your hair with a mild specific shampoo, a sulfate-free shampoo, or a swimmer's shampoo, which neutralize chemical residues.
• Apply a nourishing treatment or a repairing mask to restore the hair fiber.
• Don't forget to take care of your skin with a suitable moisturizer after swimming.

These simple gestures limit the appearance of green reflections and preserve the beauty of your hair.

Home remedies for removing green tints

If green tints persist despite these precautions, there are several effective natural remedies:

• Aspirin: crush an effervescent tablet, mix with water, apply to hair for 10-15 minutes, then rinse.
• Aspirin-lemon mixture: aspirin, lemon juice, and water, similar application.
• Vitamin C crystals: mix with water, apply to wet hair, leave on for a few minutes, then rinse.
• Baking soda: mix with water, apply for 5-10 minutes, then rinse.
• Tomato paste: apply to washed, damp hair, leave on for 30 minutes, then rinse.

It is recommended that you test these treatments on a small strand of hair before applying them to the entire head.

When to see a professional

If the green tint persists despite these treatments, it is recommended that you consult a professional hairstylist. They can offer detoxifying treatments or specialized care to remove copper and chlorine residues embedded in the hair shaft, and recommend suitable products to maintain the results at home.

Special precautions for blonde hair

Blond hair, which is particularly fragile, requires enhanced hydration to seal the hair cuticles and limit the penetration of chemical agents. It is also advisable to avoid bleaching just before a holiday by the pool, as it increases fragility and the risk of green reflections.

The Role of Pool Water Treatment

The presence of metals, particularly copper sulfates, in pool water is common for fighting algae, but it can cause hair discoloration. It is important to regularly check the copper level in your pool and adjust treatments accordingly.

Best Practices for Pool Owners

To limit the appearance of green hair, maintain balanced and clean water with an efficient filtration system. Inform users of the importance of regular water testing and encourage the use of treatments that are gentle on hair fibers.

To prevent your hair from turning green after swimming, follow these simple steps:

• Wet your hair before swimming.
• Apply a protective product.
• Wear a silicone swim cap.
• Rinse and wash your hair with a suitable shampoo after swimming.
• Nourish your hair with a restorative treatment.

If you have green tones in your hair, natural remedies and professional treatments are effective ways to restore your natural color.