Maintaining the perfect shade of blonde hair is a delicate art. Whether you favour cool platinum, silvery ash, or a neutral beige, preventing unwanted tones is key to keeping your colour looking fresh and sophisticated. While purple shampoos have long been the go-to for battling yellow tones, a new player has entered the scene: black shampoo. This intriguing product offers a different approach to toning, but it's essential to understand how and when to use it to achieve the desired results and avoid a colour mishap.
What Is Black Shampoo?
Unlike its name might suggest, black shampoo is not designed to dye your hair black. It is a toning shampoo formulated with dark pigments. These pigments can come from various sources, most commonly activated charcoal, but also a specific blend of blue, red, and yellow pigments that combine to create a dark, neutralising base. The primary function of black shampoo is to counteract specific unwanted tones in lightened hair, working on a different spectrum than the more common purple or blue shampoos.
How Does It Work on Blonde Hair?
The principle behind black shampoo lies in basic colour theory. To cancel out an unwanted colour, you use its opposite on the colour wheel. Purple shampoos are effective because purple is opposite yellow, neutralising those common brassy tones. Black shampoos take this a step further. Since black is a combination of all primary colours (in pigment terms), it has the ability to neutralise a broader range of brassy tones, including stubborn yellow-orange and even orange hues that purple shampoo might struggle with. Its dark, cool-toned base provides a powerful neutralising effect, making it particularly useful for achieving very cool, ashy, or steely finishes.
When Is It a Good Idea to Use Black Shampoo?
Black shampoo can be a fantastic tool for certain shades and situations. Understanding its ideal use cases will help you get the most out of the product.
For Maintaining Cool and Ashy Blondes
If your goal is to maintain a platinum, silver, grey, or very ashy blonde, black shampoo can be your best friend. It excels at eliminating any hint of warmth, helping to preserve that crisp, cool finish between salon visits. It provides a deeper level of toning than many purple shampoos, giving the hair a modern, steely look.
To Counteract Stubborn Brassiness
Sometimes, blonde hair can develop very stubborn orange or strong yellow-orange tones that purple shampoo can't fully correct. This can be due to the hair's natural underlying pigment or external factors like hard water minerals. The potent neutralising power of black shampoo is often strong enough to cut through this persistent brassiness and restore a more neutral, balanced shade.
As Part of a Customised Toning Routine
You don't have to choose just one toning shampoo. Many people find success by alternating between different products. For example, you might use a purple shampoo for weekly maintenance and incorporate a black shampoo every few weeks for a deeper toning session or to tackle any stubborn warm spots that appear.
When to Avoid or Be Cautious with Black Shampoo
Despite its benefits, black shampoo is not a universal solution for all blondes. Using it on the wrong hair colour or type can lead to undesirable results.
On Warm, Golden, or Honey Blondes
If you love your warm, golden, or honey-toned blonde hair, you should avoid black shampoo. Its powerful cooling effect will work against these desired warm tones, potentially making your hair look dull, muddy, or even greyish. It is specifically formulated to neutralise warmth, not enhance it.
On Very Porous or Damaged Hair
Hair that is highly porous, such as hair that has been extensively lightened or damaged, absorbs colour very quickly and unevenly. When using black shampoo on such hair, there's a risk of it grabbing onto the pigment too strongly, resulting in patchy, grey, or overly dark streaks. It is crucial to perform a strand test before applying it all over your head.
To Avoid Over-Toning
Like any toning product, overuse can lead to build-up. Using black shampoo too frequently can deposit too much pigment, causing your blonde to look dark, dull, and lose its dimension and shine. It's a powerful product that should be used judiciously.
Tips for Correct Application
To use black shampoo safely and effectively, follow these simple steps:
- Wear Gloves: The dark pigments can stain your hands and fingernails, so wearing gloves during application is highly recommended.
- Start Small: If it's your first time, mix a small amount with your regular shampoo to dilute its potency. You can also start by leaving it on for a very short time, like 1 minute.
- Apply Evenly: Apply the shampoo to wet hair, focusing on the areas where you see the most unwanted warmth. Lather well to ensure even distribution.
- Time it Right: The processing time will vary based on the product and your hair's porosity. Generally, 1-5 minutes is sufficient. Always follow the product's instructions and err on the side of less time initially.
- Rinse Thoroughly: Make sure you rinse all the product out of your hair until the water runs clear.
- Follow with Hydration: Toning shampoos can be somewhat drying. Always follow up with a nourishing conditioner or a deep conditioning mask to restore moisture and keep your hair healthy and soft.
