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The Magic of Fermented Black Rice Water

Viori Team · Oct 23, 2025 ·
Updated Nov 3, 2026 · 2 min read

Viori Longsheng Rice Water Treatment canister with rice and pink flowers

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The quick answer

Rice water is the starchy water left after soaking or boiling rice, and it is mainly used as a rinse to make hair feel smoother and look shinier. Fermenting it for a day or more makes it mildly acidic. Black rice water adds anthocyanin pigments, but evidence of extra hair benefits is mostly anecdotal.

Use about 1 part rice to 4 parts water, by weight.
Ferment 1 to 3 days at room temperature; discard any batch with mold.
Refrigerate and use within about a week; dilute 1:1 for a final rinse.

There's one treatment worth a closer look: fermented black rice water.

Why Black Rice Water Leaves Regular Rice Water in the Dust

If you've scrolled through beauty TikTok in the last few years, you've undoubtedly seen rice water tutorials everywhere. But what most people don't realize is that black rice (sometimes called "forbidden rice") can be used too.

The deep purple-black color comes from anthocyanins - the same powerful antioxidants found in blueberries and acai.

Fermented rice water is usually acidic, and an acidic rinse can help cuticles lie flat for more shine.

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Perfecting the Fermentation Process

A few details help achieve consistent results:

Fermentation Time

Recipes online differ on how long to ferment at room temperature.

The "Breathable" Method

Don't seal your container completely! Place a paper coffee filter secured with a rubber band over the jar. This allows just enough oxygen exposure to create the perfect ecosystem of beneficial bacteria and yeasts.

The Golden Ratio

Mix 1 part black rice to 4 parts filtered water (by weight). This concentration provides enough nutrients without risking product buildup, particularly important for those with fine hair textures.

Custom Benefits for Your Specific Hair Type

The benefits manifest differently depending on your natural texture:

For Curly and Coily Hair (Types 3-4)

Rice water contains amino acids and inositol, which some people with curly and coily hair find helpful.

For Straight and Wavy Hair (Types 1-2)

Some people with straighter hair types find rice water rinses add body without stiffness.

How to Incorporate It Into Your Routine (Without Creating Extra Work)

Here's how to integrate fermented black rice water into an existing routine:

As a Pre-Shampoo Treatment: Apply to dry hair and allow it to sit for 15 minutes before shampooing. This gives the nutrients time to penetrate without interfering with your regular cleansing routine.
As a Final Rinse: After conditioning, pour diluted fermented rice water (1:1 with plain water) over your hair as a final step.
As a Leave-In Treatment: For severely damaged hair, spray lightly diluted rice water on damp hair before applying your regular styling products.

Store it in your refrigerator between uses and make fresh batches regularly. The slight vinegar smell that develops dissipates quickly once your hair dries, and it won't compete with your favorite fragranced products.

This isn't just another trendy ingredient with clever marketing. It's a sustainable approach to hair care that draws on centuries of traditional wisdom.

Common questions

What is rice water good for in hair?

Rice water is mostly used to make hair feel smoother, look shinier and detangle more easily. It contains starch, small amounts of protein and B vitamins such as inositol, which coat the strand. Results are largely based on long traditional use and personal experience rather than strong research.

Is fermented rice water better than plain rice water?

Many people prefer it. Fermentation lowers the pH so the rinse is mildly acidic, which helps the cuticle lie flat and can add shine. It also breaks down some starch. The downsides are a sour smell and a short shelf life, even in the fridge.

Is black rice water different from white rice water?

Black rice contains anthocyanins, the dark purple antioxidant pigments also found in blueberries, which white rice lacks. Both make a similar starchy rinse. Black rice water may leave a slight tint on very light or bleached hair, so test a small section first.

How do you make fermented rice water for hair?

Rinse rice, then soak about 1 part rice in 4 parts filtered water. Strain the water into a jar, cover it loosely, and leave it at room temperature for 1 to 3 days until it smells slightly sour. Refrigerate it and dilute with water before use.

Does fermented rice water make hair grow faster?

There is no strong evidence that it speeds growth at the root. What people usually notice is less breakage and tangling, which helps hair keep its length. If you are losing hair or seeing thinning, a dermatologist is the right person to check the cause.

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The Magic of Fermented Black Rice Water