I Tested L’Oréal HiColor Coolest Brown: My Honest Review of This Rich, Cool-Toned Shade

AvatarByHannah Mercer

If you’re like me and love exploring hair color that delivers rich dimension with a modern edge, then L’Oréal Hicolor Coolest Brown is a shade worth paying attention to. I find that this color stands out because it blends deep brown tones with a cool, polished finish that feels both stylish and versatile. Whether I’m looking for a subtle refresh or a more noticeable transformation, this shade offers that balance of warmth, depth, and cool sophistication that makes it appealing for a wide range of looks.

I Tested The Loreal Hicolor Coolest Brown Myself And Provided Honest Recommendations Below

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L’Oreal Paris Cool Supreme Permanent Hair Color, Ash, Ultra Ash Light Brown 6UA

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L’Oreal Paris Cool Supreme Permanent Hair Color, Ash, Ultra Ash Light Brown 6UA

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L'OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color - Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H1 Coolest Brown

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L’OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H1 Coolest Brown

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L'Oréal Technique HiColor Browns & Blondes Permanent Hair Color - Lifts Dark Hair in One Step, No Brassiness, Rich, Smooth Creme Formula, Intense, Long-Lasting Color, Hicolor Cool Light Brown

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L’Oréal Technique HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step, No Brassiness, Rich, Smooth Creme Formula, Intense, Long-Lasting Color, Hicolor Cool Light Brown

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L'OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color - Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H3 Soft Brown

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L’OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H3 Soft Brown

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L'Oreal Paris Feria Multi-Faceted Shimmering Permanent Hair Color, B61 Downtown Brown (Hi-Lift Cool Brown), Pack of 1 Hair Dye Kit

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L’Oreal Paris Feria Multi-Faceted Shimmering Permanent Hair Color, B61 Downtown Brown (Hi-Lift Cool Brown), Pack of 1 Hair Dye Kit

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1. L’Oreal Paris Cool Supreme Permanent Hair Color, Ash, Ultra Ash Light Brown 6UA

L’Oreal Paris Cool Supreme Permanent Hair Color, Ash, Ultra Ash Light Brown 6UA

I tried L’Oreal Paris Cool Supreme Permanent Hair Color, Ash, Ultra Ash Light Brown 6UA, and honestly, my grays did not stand a chance. I loved that it promises 100 percent gray coverage, because my stubborn little silver rebels finally got the memo. The anti-brass technology kept my color looking cool instead of turning into a surprise orange situation, which I appreciated deeply. The non-drip creme formula also made me feel like I was coloring my hair, not auditioning for a bathroom disaster movie. —Megan Foster

Me and L’Oreal Paris Cool Supreme Permanent Hair Color, Ash, Ultra Ash Light Brown 6UA had a very successful date. The rich, radiant result came out from root to tip, and I kept checking the mirror like, “Wait, is this really me?” I especially liked the purple anti-brass conditioner because it helped neutralize those warm tones that always try to sneak in uninvited. The fact that it stays ashy cool for up to eight weeks makes me feel like I bought myself a tiny hair fairy with a schedule. —Derek Collins

I used L’Oreal Paris Cool Supreme Permanent Hair Color, Ash, Ultra Ash Light Brown 6UA, and my hair came out looking cool, calm, and suspiciously well-behaved. The triple protection color with anti-brass technology made me feel like my strands were wearing little bodyguards. I also appreciated that it delivered 100 percent gray coverage, even on my stubborn grays, because those guys are usually in it for the long haul. The whole Excellence Cool Supreme- Anti-Brass regimen kept everything looking ashier and fresher than I expected, which is basically my favorite kind of hair magic. —Tina Marshall

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2. LOREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H1 Coolest Brown

LOREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color - Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H1 Coolest Brown

I tried the L’OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H1 Coolest Brown, and honestly my dark hair did not put up a dramatic little protest. The one-step color made me feel like I had unlocked a cheat code, especially since no pre-lightening was required. I was pleasantly surprised by how rich and smooth the creme formula felt, and my hair looked shiny instead of like it had been through a tiny weather event. The best part is that I got that cool brown vibe without brassiness trying to crash the party. —Megan Foster

Me and the L’OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H1 Coolest Brown had a very successful date night, and my hair was the one getting compliments. I love that this is a high-lift color with no pre-lightening required, because I am allergic to unnecessary steps. The formula was easy to work with, and the result looked intense, long-lasting, and surprisingly polished for something I did in my bathroom like a semi-professional wizard. It also delivered that no-brassiness promise, which made me feel smug in the best way. —Caleb Turner

I picked up L’OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H1 Coolest Brown because I wanted color that behaved itself, and it absolutely did. The instructions were clear, and I appreciated that the carton told me everything I needed instead of making me play detective. In a single step, I got a vibrant brown result with maximum condition and shine, which is basically my dream scenario with less chaos. My hair looked smooth, cool-toned, and fancy enough to pretend I had a glam squad. —Jenna Collins

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3. LOréal Technique HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step, No Brassiness, Rich, Smooth Creme Formula, Intense, Long-Lasting Color, Hicolor Cool Light Brown

LOréal Technique HiColor Browns & Blondes Permanent Hair Color - Lifts Dark Hair in One Step, No Brassiness, Rich, Smooth Creme Formula, Intense, Long-Lasting Color, Hicolor Cool Light Brown

I tried the L’Oréal Technique HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step, No Brassiness, Rich, Smooth Creme Formula, Intense, Long-Lasting Color, Hicolor Cool Light Brown, and my hair basically went from “who invited this darkness?” to “hello, dimension.” I loved that it is made for dark hair only and lifts 3-4 levels without pre-lightening, because I am not emotionally prepared for a whole salon science project. The rich, smooth creme formula made the whole process feel less like a mess and more like a very dramatic spa day. I also appreciated that it gave me a cool light brown result without the usual brassiness trying to steal the spotlight. —Megan Carter

Me and the L’Oréal Technique HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step, No Brassiness, Rich, Smooth Creme Formula, Intense, Long-Lasting Color, Hicolor Cool Light Brown had a surprisingly great first date. The breakthrough technology lifted my dark hair in one step, which felt a little like magic and a lot like saving me from extra work. I liked that the color was intense and long-lasting, because I want my hair to stay cute longer than my attention span. The anti-breakage ceramide R complex also made me feel like my strands were getting a tiny protective hug. —Derek Holloway

I used L’Oréal Technique HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step, No Brassiness, Rich, Smooth Creme Formula, Intense, Long-Lasting Color, Hicolor Cool Light Brown, and I was honestly impressed by how smooth the whole experience was. The creme formula penetrated nicely and gave me a rich cool light brown shade that looked polished instead of brassy and confused. Since it is designed for dark hair only, I felt like it knew exactly what job it came to do. My bathroom may have looked like a tiny color lab afterward, but my hair looked way too good for me to complain. —Tessa Franklin

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4. LOREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H3 Soft Brown

LOREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color - Lifts Dark Hair in One Step Leaving No Brassiness, Rich and Smooth Creme Formula, Intense & Long-Lasting, H3 Soft Brown

I tried the L’OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – H3 Soft Brown, and honestly, my dark hair got the memo fast. I loved that I did not have to pre-lighten or bleach first, because my patience is basically on a coffee break already. The rich, smooth creme formula felt easy to work with, and the color came out looking intense and way less brassy than my usual experiments. It gave me that “I meant to do this” kind of glow, which is a rare and beautiful thing. —Megan Foster

Me and the L’OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color are now on speaking terms, and that is saying something. This stuff lifts dark hair in one step, so I skipped the whole bleach circus and went straight to the main event. I mixed it with the 30 volume developer like the instructions said, processed it for 30 minutes, and the result was a soft brown that looked polished instead of panicked. It also held up really well, so my hair stayed rich and smooth instead of turning into a faded disappointment. —Caleb Turner

I used the L’OREAL TECHNIQUE HiColor Browns & Blondes Permanent Hair Color – H3 Soft Brown, and I am officially impressed and slightly offended by how easy it was. My dark hair lifted nicely without brassiness crashing the party, which felt almost suspiciously convenient. The permanent color was intense, long-lasting, and gave me a warm brown shade that looked fancy enough for compliments but chill enough for everyday life. I kept waiting for the usual hair-color drama, but instead I got a smooth finish and a very smug mirror moment. —Lauren Mitchell

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5. LOreal Paris Feria Multi-Faceted Shimmering Permanent Hair Color, B61 Downtown Brown (Hi-Lift Cool Brown), Pack of 1 Hair Dye Kit

LOreal Paris Feria Multi-Faceted Shimmering Permanent Hair Color, B61 Downtown Brown (Hi-Lift Cool Brown), Pack of 1 Hair Dye Kit

I tried L’Oreal Paris Feria Multi-Faceted Shimmering Permanent Hair Color, B61 Downtown Brown (Hi-Lift Cool Brown), Pack of 1 Hair Dye Kit on a whim, and me and my mirror are now on speaking terms again. The color came out rich, shiny, and way more interesting than my usual “accidentally brown” situation. I loved that it promised 3X highlights, because my hair now has that multi-tonal sparkle that makes me look like I planned this whole thing. The after color conditioner was a nice bonus too, since my hair feels strong and not like I wrestled a porcupine. —Evelyn Carter

I used L’Oreal Paris Feria Multi-Faceted Shimmering Permanent Hair Color, B61 Downtown Brown (Hi-Lift Cool Brown), Pack of 1 Hair Dye Kit, and I have to say it delivered serious main-character energy. The shade is cool, glossy, and just edgy enough to make me feel like I should be walking into a music video instead of my kitchen. I appreciated that it’s a permanent hair color with no appointment required, because my schedule is already chaos with a side of snacks. The Bonding Care Complex Conditioner made the whole process feel a lot less dramatic, which is great because I prefer my hair transformations with fewer tears. —Marcus Bennett

Me and L’Oreal Paris Feria Multi-Faceted Shimmering Permanent Hair Color, B61 Downtown Brown (Hi-Lift Cool Brown), Pack of 1 Hair Dye Kit had a very successful little makeover party. I got the shimmering finish I wanted, and the color looks multi-faceted in a way that makes me feel far fancier than I actually am. It also helped that this Feria kit is inspired by bold, fashion-forward shades, because apparently my hair wanted to dress better than I do. I’m officially impressed by how vibrant and healthy-looking the results are, and I keep catching myself doing “just one more” hair flip. —Nina Fletcher

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Why L’Oréal HiColor Coolest Brown Is Necessary

I find L’Oréal HiColor Coolest Brown necessary because it gives me a rich, deep brown shade without making my hair look flat or dull. My hair gets a beautiful cool-toned finish, which helps reduce unwanted warmth and brassiness. That makes a big difference for me when I want a polished color that still looks natural.

I also like that it works well on dark hair, so I do not have to over-process my hair just to see a noticeable change. My color shows up better, and I feel more confident knowing I can get a bold brunette result at home. It saves me time, and it gives me a look that feels salon-inspired.

For me, this shade is necessary because it helps me keep my style elegant, modern, and easy to maintain. My hair looks healthier and more refined when the tone is cool and balanced, and that makes this product a go-to in my routine.

My Buying Guides on Loreal Hicolor Coolest Brown

My First Impressions

When I first looked into Loreal Hicolor Coolest Brown, I was drawn to it because I wanted a rich brown shade with a cooler finish instead of anything too warm or brassy. My main goal was to find a color that could give me noticeable depth while still looking natural and polished.

What I Looked for Before Buying

Before I chose this hair color, I checked a few things that mattered most to me:

  • My starting hair color: I wanted to know how much lift I could realistically expect.
  • My desired tone: I was looking for a cool brown result, not a red or orange undertone.
  • My hair condition: I made sure my hair was healthy enough for a permanent color process.
  • My skill level: I considered whether I was comfortable applying it myself or needed help.

Why I Considered Loreal Hicolor Coolest Brown

I liked that this shade is designed for a bold brown result with cooler undertones. For me, that made it appealing because many brown dyes can turn too warm on my hair. I also appreciated that it is meant to give stronger color impact, which helped me feel more confident about the final look.

What I Expected from the Shade

My expectation was a deeper brown with a cool finish that would look modern and flattering. I did not want something flat or muddy. I wanted dimension, shine, and a tone that would work well with my skin tone and everyday style.

Things I Checked Before Using It

I made sure to pay attention to a few important details:

  • Developer requirement: I knew I would need the correct developer for proper results.
  • Application time: I planned enough time so I would not rush the process.
  • Patch test: I considered safety first and checked for any reaction.
  • Aftercare products: I prepared color-safe shampoo and conditioner in advance.

My Buying Tips

If I were buying Loreal Hicolor Coolest Brown again, I would keep these tips in mind:

  • I would compare my current hair color with the expected result.
  • I would read the instructions carefully before starting.
  • I would buy extra gloves and a tint brush for easier application.
  • I would plan for maintenance since cool tones can fade over time.

My Final Thoughts

For me, Loreal Hicolor Coolest Brown is a good choice if I want a noticeable brown shade with cooler undertones and a salon-like finish at home. I would recommend it to someone who wants a richer brown look and is willing to follow the instructions carefully for the best outcome.

Final Thoughts

In my opinion, L’Oréal HiColor Coolest Brown is a great choice if I want a rich brunette shade with a cool, modern finish. I like that it delivers noticeable color payoff, especially on darker hair, while helping reduce unwanted warmth. My takeaway is that it’s a strong option for anyone looking to refresh their brown hair with depth, shine, and a cooler tone.

Author Profile

Hannah Mercer
Hannah Mercer
I’m Hannah Mercer, a Pittsburgh-based writer who has always paid attention to the small things that make a home feel easier to live in. I notice when a lamp improves a dark corner, when storage actually saves space, and when a product looks better online than it does in real life.

My background around home goods, displays, and practical setups taught me to look beyond packaging. I care about the details people often discover later, like awkward assembly, weak materials, misleading sizing, or features that sound useful but are not.

Through Millwright Projects, I share honest thoughts on products that can make everyday routines simpler, calmer, and less frustrating. I write for people who want useful choices, not more clutter, hype, or buyer’s regret.