TL;DR: In most cases, you should arrive at your salon appointment with dry, unwashed hair (at least 24 hours post-wash), as the natural oils can help protect your scalp from irritation, especially during bleaching.
Whether or not you should wash your hair before coloring it is one of the most common questions stylists receive, and the answer can impact both your comfort and your color results. To get to the bottom of the clean-versus-dirty hair debate, Hair.com spoke with L’Oréal Professionnel artist Katie Collette. Ahead, she explains exactly how to prep your hair for your next color service.
Key Takeaways
• For services involving bleach or for those with sensitive scalps, it is best not to wash your hair for 1-2 days before your appointment. The natural oils (sebum) that build up can form a protective barrier on the scalp, reducing potential irritation from chemicals.
• For services where precise color matching is crucial, such as adding lowlights or going darker, clean hair can provide a more accurate canvas. An excess of oil or product buildup can make hair appear darker, potentially altering your stylist’s formulation.
• Regardless of whether your hair is clean or dirty, always arrive at the salon with your hair completely dry. Most permanent color formulas are designed for application on dry hair, and showing up with wet hair can disrupt your stylist's schedule.
Should My Hair Be Clean or Dirty When I Dye It?
If you’ve ever wondered, “Should I wash my hair before color?” Unfortunately , there isn’t a one-size-fits-all answer: Whether or not you’re better off going to the salon with dirty hair ultimately depends on factors like your skin type and hair type. For example, if you have sensitive skin, skipping a wash or two allows natural oils (a.k.a. “grease”) to build up on your scalp. These oils can, in theory, help protect the scalp against potential irritation caused by the dye — think of it as a scalp-first approach to hair coloring. That’s not to say that dyeing freshly washed hair is out of the question, though. You can also ask your stylist about using an ammonia-free hair dye to help reduce the chances of an adverse reaction. However, even if you do opt for an ammonia-free dye, having a layer of natural oil on the scalp is still a beneficial protective measure.
As mentioned, your hair type can play a role, too. Those with oily hair may only need to wait one day between their last shampoo and next dye job. People with dry hair, meanwhile, may need 2-3 days in between to allow enough oil to build up.
Does Hair Dye Work Better on Clean or Dirty Hair?
Hair dye doesn't necessarily "work better" on one or the other — it's more about ensuring optimal conditions for your specific service. While dirty hair helps protect the scalp, extremely oily hair or hair with lots of product buildup can sometimes prevent the color from being absorbed evenly. The best approach is balanced: hair that is not freshly washed, but also not excessively greasy or full of product.
Does The Coloring Service Matter?
Good hair day by @fouronethree_salon.
Yes. Another way to decide whether or not you should show up for your appointment with freshly washed hair is to consider your chosen color service. Normally, heading to the salon with oily strands wouldn’t make too much of a difference for a simple root touch-up. However, Collette warns that unwashed hair can alter the results of a full-head dye job, especially if you have lighter hair. She explains that the oils in dirty hair can actually make your hair look a shade or two darker than it truly is. As a result, you may need to lather up before your color appointment so your stylist can get a precise look at your hair’s current level.
The same also applies to darker tones, according to Collette. “Anytime you want to deepen your color or add lowlights, clean hair offers the most accurate read of your natural color,” she says. “This will allow your colorist the best match when determining the level of depth for your service.”
Is It Best To Skip a Wash or Two Prior To Bleaching?
Good hair day by @hair.julierussita.
Yes. Know what your desired color entails and prepare accordingly. For light blonde or fantasy colors that require a decent amount of bleaching, it’s generally best to skip a few washes before hitting the salon. Collette says bleach typically shouldn’t irritate your scalp, but it can’t hurt to let oil build up and add an extra layer of protection between your skin and the bleach.
Keep in mind that color-wise, the end result will usually be the same whether you’re going to the salon with freshly washed or dirty hair. Allowing oil to accumulate before bleaching your strands is solely to nourish your scalp and should have no impact on your desired color.
What Happens if I Wash My Hair Right Before Dyeing It?
Washing your hair right before dyeing it strips the scalp of its protective oils, which can make it more susceptible to irritation and itching from the hair color or bleach. While it won't necessarily ruin the color result (especially for darker dyes), it removes a natural safety barrier, which is why stylists almost always recommend against it.
Can I Dye My Hair One Day After Washing It?
Yes, dyeing your hair one day after washing it is perfectly fine. For many people, one day is enough time for a sufficient amount of natural oil to build up on the scalp to provide some protection. This is often the ideal middle ground for achieving both scalp comfort and a clean-enough canvas for your stylist.
How Many Days Should I Not Wash My Hair Before Coloring?
A good rule of thumb is to not wash your hair for at least 48 hours before your coloring appointment. This gives your scalp enough time to produce natural oils that help protect it during the chemical process. This is particularly important for those with sensitive skin or anyone undergoing a significant lightening service. Pro tip: Ask a stylist if a pre-color clarifying wash — done a few days in advance — is right for you, especially if you have hard water.
Is It Best To Show Up to My Appointment With Wet Hair?
No. Most permanent hair color formulas need to be applied to dry hair and having to dry your hair at the start of the appointment can result in wasted time and even extra fees. Whether you choose to wash your hair prior to your appointment or arrive with second-day strands, make sure your hair is dry by the time you arrive at the salon.
Is It Okay to Have Dry Shampoo in My Hair When I Color It?
It is generally okay to have a small amount of dry shampoo in your hair, but you should avoid having heavy product buildup. A lot of buildup from products like dry shampoo, hairspray, or styling creams can interfere with how the color penetrates the hair shaft. If you need to use dry shampoo, apply it lightly and make sure to tell your stylist what products are in your hair.
Should I Take a Break From Shampooing After My Appointment?
Yes. Whether you've gone lighter or darker, it's totally fine (in fact, it's encouraged) to wait at least 48 hours before washing your hair after your coloring appointment. Doing so gives your new hue more time to bond with your strands and can help your dye job last longer and appear more vibrant. If you can’t stand having greasy roots, give them a few quick sprays of Redken Deep Clean Dry Shampoo to help refresh up to fourth-day hair.
Once you do suds up, reach for a color-protecting shampoo and conditioner system like Matrix Color Obsessed Shampoo and Color Obsessed Conditioner. This antioxidant-infused duo helps enhance shine and extend the life of color-treated hair by up to 32 washes. And, if you bleached your hair, you’ll also want to swap a toning shampoo into your routine to keep brassy undertones at bay. Matrix So Silver Purple Shampoo helps neutralize yellow warmth in blonde to gray hair, while Matrix Brass Off Shampoo is ideal for removing orange tones in lightened brunette hair.
Next Up: Here's How Often You Should Really Wash Your Hair
For more expert advice, use our salon locator to book an appointment with a pro near you.
Header photo credits (left to right): @hair.julierussita and @matrix
