Skip to product information
1 of 10


4N Medium Brown Heat Activated Hair Dye With Organic Ingredients 120 mL / 4 fl. oz.

Regular price
$ 29.50
Regular price
Sale price
$ 29.50
Shipping calculated at checkout.

NATURALCOLORS® heat activated healthier permanent hair color dye with certified organic ingredients. 2-in-1 Hair Color and Hair Care with added vitamins! Hair coloring kit for home use.

ONC NATURALCOLORS is different from conventional hair color. It does not use harsh chemicals to raise the pH level to open cuticles. Instead, natural, molecule-size pigments infuse your hair with color when exposed to heat. It is low pH. As a result, your hair remains vibrant, soft, and healthy!

NATURAL SHADES will not turn black hair blonde. They will lift 1-2 shades.

1N, 2N, 3N, 4N, 5N, 6N, 7N, and 8N will lift your current color by one shade and cover gray 100%.

With organic argan oil, aloe vera, orange extracts, chamomile, coconut oil, and vitamins. These leave your hair feeling softer, smoother, and shinier!

ONC NATURALCOLORS is as chemical-free as possible and still get permanent results. In short - Organic hair color that works!


How to use the ONC Thermal Heat Cap for ONC NATURALCOLORS hair coloring process

How to use a hair dryer for ONC NATURALCOLORS hair coloring process

Customer Reviews

Based on 19 reviews
Beautiful Color!

I've been using ONC for a couple of years now & won't use anything else on my aging, curly, brunette hair. They're a bit pricier but it's so worth it because the ingredients aren't toxic (that I know of) & it doesn't fry my hair like so many other brands do. I do wish the color would last a bit longer tho', as I'm having to color it every 4 to 5 weeks & as one ages, it gets tougher & tougher to do one's own hair.

First try went well

I tried this color for the first time after having used store box medium brown for years wanting to get away from chemicals as much as possible while still using a reasonable process to color my hair that seemed reliable. It is really just as easy as the box at the store and did not have the stinging of the eyes and scalp burning. Also, there was no itchiness on my scalp or leftover dye on on it after washing it out and I did not have the extreme dryness the box dye created each month. I have resistant gray and it covered great and three weeks later is wearing well. The only thing I found is the coverage is very uniform upon application, hiding my natural highlights, but after a wash or two it eases up to let natural tones through.

Nanette Knight
Great color

I absolutely love this product. I have looked for years for a cleaner hair dye and this product makes my 74 year old hair look very natural and healthy. It’s my favorite. It is very easy to use and much safer than other dyes. The color, 4N, is a dark chestnut. Funny, but I look forward to coloring my hair now. No burning feel, no smell, covers my gray well, and the result is soft and beautiful hair. Thanks for a great product.

Emily Posatko
2nd use

I like the color however, the second time I used the product (same color as 1st time) it did not cover my gray roots. It would help if the mixing cup had measuring notations on it. I may not have used the same amount of color gel as the first time I used the product when gray root coverage was good.

Angelique Pitney
Love this!

I’ve been coloring my hair forever and always looking for the right red. After giving up toxic ingredients in every aspect of my life covid finally led me to giving up toxic hair color. I mix this with one other color to give me a beautiful auburn it’s really easy to use —there’s no stinging no burning. Now that my hairdresser is back at work I take it with me to him. It covers gray nicely especially for a clean line!

    ONC NATURALCOLORS 4N Natural Medium Brown Hair Dye With Organic Ingredients 120 mL / 4 fl. oz.
    ONC NATURALCOLORS 4N Natural Medium Brown Hair Dye With Organic Ingredients Modelled By A Girl
    ONC NATURALCOLORS 4N Natural Medium Brown Hair Dye With Organic Ingredients 120 mL / 4 fl. oz.
    ONC NATURALCOLORS 4N Natural Medium Brown Hair Dye With Organic Ingredients 120 mL / 4 fl. oz.
    ONC 4N Natural Medium Brown Hair Dye With Organic Ingredients 120 mL / 4 fl. oz. Color Results
    4N Medium Brown Heat Activated Hair Dye With Organic Ingredients 120 mL / 4 fl. oz.
    4N Medium Brown Heat Activated Hair Dye With Organic Ingredients 120 mL / 4 fl. oz.
    ONC NATURALCOLORS 4N Natural Medium Brown Hair Dye With Organic Ingredients 120 mL / 4 fl. oz.
    FREE SHIPPING on all orders over $54
    Free Consultation


    • Ammonia Free

    • Hydrolyzed Ingredients

    • Gluten Free

    • Cruelty Free


    How does NATURALCOLORS get into hair?

    NATURALCOLORS has a lower pH compared to chemical hair colors with toxic chemicals. Applying heat is necessary to open the hair cuticle in uncolored hair. To get color into your uncolored hair without harsh, toxic chemicals, medium heat from a hair dryer or a thermal heat cap (sold separately) is needed. These soften the cuticle and allow ONC color pigments to be deposited into hair. It does not damage hair or make it fallout.

    What does 2-in-1 Hair Color and Hair Care in one bottle mean?

    NATURALCOLORS does not have the harsh chemicals other colors have. It has a low pH. Therefore the formula has added vitamins, essential oils, and herbal extracts. These help repair, maintain, and nourish your hair. They would not survive in a chemical hair color. Hence — 2-in-1 Hair Color and Hair Care ... in one bottle!

    Why is NATURALCOLORS' low pH so good?

    NATURALCOLORS low pH does not open the pores of your scalp. So chemicals cannot seep into your bloodstream. When chemicals get in the bloodstream they end up in your liver. The body cannot clean these from your liver. Because the chemicals that make chemical color stick to your hair make it stick to your liver. This is one reason why breast cancer grows year by year.

    Why do I get a decreased demarcation line?

    Unlike Hair Colors with toxic chemical which operates at a high pH, swelling the cuticle to force pigments into your hair, NATURALCOLORS moisturizes your hair which softens the cuticle. This allows it to open at a lower pH and enables the color to wind itself through the layers of your hairs’ cuticle. It only removes enough color to make room for NATURALCOLORS inside your hair. There is no demarcation line. As the natural ingredients in your hair like protein, pigment and moisture are intact. As a result the color fades over time. Whereas all other colors leaves a blank space. Where the natural protein and pigment of your hair is removed. This then replaced by chemical hair color. ONC NaturalColors only removes minimal amount and replaces it with a formula made up of low pH, organic ingredients.


    darke brown hair color
    light golden brown hair
    natural brown hair color
    natural hair color

    8N Natural Light Brown

    Gentle lightened my hair, nice blonde shade without the damage

    Veronica V.

    ONC SILVER Neutralizing Shampoo

    I have blonde hair and this shampoo does miracles! I leave it on 5-10 minutes and then rinse it and all the brassiness in my hair is gone! I absolutely love this product from ONC!


    QUINOAPLEX R3 Rapid Hair Renewal Formula

    I love this product. I get so may compliments about my hair after I apply this product. I usually spray it on after I towel-dry my hair. My wavy hair looks very healthy and shiny. I look so put together without too much effort.

    Jennifer R.

    7RN Irish Red

    Beautiful color without pain an stinging. Easy to apply and gorgeous color. Restores my natural red hair to my youthful color. I am hooked on ONC color. I highly recommend this for those who want a natural looking color without harmful side effects.

    Ed G.

    1N Natural Black

    I am in love with my results the natural black hair color is ammonia free, leaves your hair silky and smooth. I would again and I highly recommend this product.

    Erica L.

    Share your moments with ONC. We will choose the winner every month to receive FREE Products

    Use #oncnaturalcolors to share your moments on INSTAGRAM