guide · 6 min read
Best Shampoo Bar for Color-Treated, Blonde & Gray Hair
The quick answer
Choose a mild, sulfate-free syndet bar, not a soap bar, that is pH balanced and color-safe. Lather it in your hands, wash with cool water, and condition every time. Blonde, highlighted and gray hair can add a purple bar once or twice a week. Viori's Rice Water Shampoo Bar – All Hair Types is a good everyday pick.
- Pick a sulfate-free syndet bar that is pH balanced and color-safe
- Lather in your hands, use cool water and condition every wash
- Blonde or gray? Use a purple bar once or twice a week, not every wash
The best shampoo bar for color-treated hair is a mild, sulfate-free syndet bar (not a soap bar) that is pH balanced and labeled color-safe. If you are blonde, highlighted or gray, add a purple bar once or twice a week to keep yellow and brassy tones in check. How you wash matters almost as much as what you wash with.
What to look for in a shampoo bar for color-treated hair
Hair color fades a little every time you wash. A good shampoo cannot stop that, but a poor one can speed it up. These points apply to any brand.
A gentle cleanser
Strong sulfate cleansers remove oil and dirt well, and they can also lift more color with each wash. A mild cleanser such as sodium cocoyl isethionate is a better fit for dyed, bleached or highlighted hair. Look for "sulfate-free" and check that a mild cleanser sits near the top of the ingredient list.
Syndet, not soap
Shampoo bars come in two kinds. Soap bars are made from saponified oils and are alkaline. Syndet bars are built on non-soap cleansers and can be made to sit in a mildly acidic range. For colored hair, a syndet bar is usually the safer choice.
A pH close to hair and scalp
Hair and scalp are mildly acidic, about 4.5 to 5.5. Alkaline products make the cuticle swell and lift, which can let color molecules escape faster. A pH-balanced bar helps keep the cuticle flat, so hair looks shinier and holds tone longer.
Conditioning ingredients
Coloring, and especially bleaching, leaves hair more porous and dry. Butters, plant oils, glycerin and aloe help the bar feel softer. Always follow with a conditioner to smooth the lengths.
Toning, if you are blonde or gray
Blonde, highlighted, silver and white hair can turn yellow or brassy between salon visits. Purple shampoos deposit a small amount of violet pigment, which sits opposite yellow on the color wheel and helps cancel it out. They are a once-or-twice-a-week step, not an every-wash product for most people.
Fragrance and silicones
Neither one affects color much, but both are worth a look. A fragrance-free bar is the gentlest option for a sensitive scalp. A silicone-free bar rinses clean, which makes it easier to see your true tone.
How to use a shampoo bar on color-treated hair
- Wait after coloring. Follow your colorist's advice on how long to wait before the first wash. Giving fresh color a few days usually helps.
- Lather in your hands. Rub the bar between wet palms and work the lather through your hair with your hands. Rubbing the bar straight onto your head adds friction and concentrates the cleanser in one spot.
- Use cool or lukewarm water. Hot water opens the cuticle and can speed up fading.
- Focus on the scalp. The scalp is where oil and buildup collect. Let the lather rinse through the lengths instead of scrubbing the ends.
- Wash less often. Fewer wash days means less fading. Many people with colored hair stretch the time between washes.
- Condition every time. Smooth conditioner over the mid-lengths and ends, where color-treated hair is usually driest.
- Use purple shampoo sparingly. If you tone, use it once or twice a week and your regular bar on other days. Leave it on a little longer on the brassiest sections, then rinse well.
- Protect from heat and sun. Hot tools and strong sun both fade color. Use a heat protectant and cover up on long days outside.
- Keep the bar dry. Store it on a draining holder out of the shower stream so it lasts.
Which Viori bar fits color-treated hair
All Viori shampoo bars are syndet bars made with fermented Longsheng rice water. The cleanser is sodium cocoyl isethionate, a mild coconut-derived cleanser. Every bar is sulfate-free, silicone-free, paraben-free, color-safe and formulated to stay between 3.5 and 6.5 pH. For color-treated hair, Viori recommends lathering the bar in your hands first instead of rubbing it on your hair.
Rice Water Shampoo Bar – All Hair Types
This is the bar Viori suggests for most hair types and the one to start with if you are not sure where to start. It works for fine, thick, straight, wavy, curly and coily hair, on oily, normal or dry scalps. Its ingredient list includes shea butter, cocoa butter, rice bran oil and aloe vera, and the scent is jasmine and soft florals.
Purple Shampoo Bar with Biotin – Blonde & Gray
Made for blonde, highlighted, gray, silver, white and salt-and-pepper hair that turns yellow or brassy between washes. Use it once or twice a week and your regular Viori bar on other days. Using it more often won't turn hair purple, because the pigment is gentle. Its ingredient list includes purple sweet potato powder and biotin, and it smells of calming lavender.
Purple Conditioner Bar with Biotin – Blonde & Gray
The matching conditioner is meant for blonde, highlighted, gray and silver hair, especially if it is dry, porous or breaking at the ends. Like all Viori conditioner bars, it is built on BTMS, cocoa butter and cetyl alcohol, and its lather is a paste rather than foam. It can also be used as a deep conditioner or a leave-in.
What customers are saying
Fragrance-Free Rice Water Shampoo Bar
Viori calls this its most gentle bar. Nothing is added for fragrance, so it suits sensitive or reactive scalps, and anyone who reacts to fragrance or simply doesn't want any. Its ingredient list includes shea butter, cocoa butter, rice bran oil and aloe vera.
A simple routine for blonde or gray hair: the Rice Water Shampoo Bar on most wash days, the purple bar once or twice a week, and a conditioner bar every time. Viori recommends giving a new routine 2 to 3 months. Questions about ingredients or use are answered in the Viori FAQ .
Common mistakes with color-treated hair
- Using a soap bar. Alkaline soap bars are a poor match for colored hair. Check the label for a syndet cleanser.
- Overusing purple shampoo. Toning every wash can leave light hair looking dull or slightly tinted. Once or twice a week is enough for most people.
- Washing with very hot water. Turn the temperature down, at least for the final rinse.
- Skipping conditioner. Colored hair is often more porous. Conditioner helps it look smoother and shinier.
- Expecting a shampoo to fix damage. A gentle bar helps protect what you have. Heavily bleached or broken hair needs a trim and a talk with your stylist.
If your scalp burns, itches or flakes after coloring, or the irritation does not settle, stop using the product that caused it and see a dermatologist. The same goes for any unusual shedding or hair loss.
Common questions
Are shampoo bars safe for color-treated hair?
Many are, but check the type. Syndet bars with a mild cleanser and a pH-balanced formula are a good fit for dyed hair. Alkaline soap bars are not. All Viori shampoo bars are sulfate-free, color-safe syndet bars formulated to stay between 3.5 and 6.5 pH.
How should you use a shampoo bar on dyed hair?
Lather the bar between wet palms and work the lather through your hair with your hands instead of rubbing the bar on your head. Use cool or lukewarm water, focus on the scalp, and follow with conditioner on the lengths.
How often should you use a purple shampoo bar?
For most people, once or twice a week is enough to keep yellow and brassy tones in check. Use a regular shampoo bar on other wash days. Viori's purple bar uses a gentle pigment, so it won't turn hair purple with more frequent use.
Which Viori bar is best for color-treated hair?
For everyday washing, the Rice Water Shampoo Bar – All Hair Types suits most hair. Blonde, highlighted and gray hair can add the Purple Shampoo Bar with Biotin once or twice a week. If your scalp is sensitive, the Fragrance-Free Rice Water Shampoo Bar is the gentlest option.
Does sulfate-free shampoo stop color from fading?
No shampoo stops fading completely. Every wash, hot water, heat styling and sun all play a part. A mild, sulfate-free, pH-balanced cleanser is gentler than strong sulfates, and washing less often with cooler water helps color last longer between appointments.
