About Henna

Nature Blessed Grey Hair Dye & Treatment

What is Henna?

Henna (Lawsonia inermis) is a plant which has been used since antiquity in ancient Egypt to dye skin, hair and fingernails, as well as fabrics including silk, wool, and leather. For the Indian Ayurveda (their traditional holistic healing system), Henna has been treated as one of the main herbs.
Henna is a gentle, effective hair & scalp treatment free of chemicals, that colours grey hair, and is widely used around the world.  K’s has implemented henna application into our head spa, as we believe in its immense benefits for both You and Earth.

For Who?

*K’s has “Clear Henna” for clients who don’t want to change their hair colour. It is a pure herbal blended henna that acts as an excellent scalp & hair treatment.

K's owner Keiko has been enjoying Henna for over 5 years.

Benefits of Henna

The more you apply henna on your head, the healthier your scalp & hair become, while chemical-based hair dyes can irritate your scalp or cause hair loss.


Most of our clients feel soothed and refreshed during and after henna application. 

Pure Henna gives an orange tone to your grey hair. K’s  offers pure herb blended henna to achieve clear, brown to soft black hair colour as well.

Henna goes into our blood vessels through our scalp (just as any other things we put on our skin do).  Actually, some studies show that the skin on your scalp is up to 4 times more absorbent than skin anywhere else.   
It is said that henna promotes the excretion of waste products / eases eye strain and headache  ( as it softens scalp ) / detoxifies the liver / balances hormone, and ease PMS, menopause and period pains (by naftakinons in henna ).
Henna has been used in India as a traditional medicine for: anti-inflammation, dermatitis and heals scars, as well.

Clients enjoy leave-in time (around 25min) with comfortable warm mist at K's.

Have you thought about the chemicals contained in the chemical hair dye making their way to our ocean through the drain ?
In Japan, around 18,000 tones of those are drained from hair salons per year. Henna is one of the solutions for both yours and the earth’s well being.

How Henna Dyes Hair

Lawsone (a tannin dye molecule) from henna enters the hair shaft via gaps in the cuticle and strengthens the cuticle by binding with keratin protein (which forms 65%-95% of hair shaft). Rather than stripping the hair of its natural colour and replacing it with the new colour as chemical dyes do, henna’s gentle process  maintains the natural structure of the hair shaft, so the hair retains its moisture and flexibility.

Henna paste coats the hair shaft, then Lawsone gradually migrates  into the cortex through gaps in cuticle. Then binds with keratin protein.

Chemical dyes lift each cuticle and  penetrate, stripping natural hair colour off the melanin. Then it deposits new colour into cuticle.

Colour variations K's offers
henna 100%
henna brown
Brown (Henna + Ayurvedic Herbs)
Soft Black (Henna + Ayurvedic Herbs)

Below are samples dyed on different coloured hair (Left one is Grey hair). As you can see, darker part of hair won’t undergo significant colour or tone changes. Please note that finished colour is unique to each individual as unlike chemical dye which override your natural colour, henna reacts to your natural tone.


We recommend to do the first 3 applications regularly for you to feel improvement on your scalp & hair.

  • If grey hair is less than 5% of your hair: once a month
  • If grey hair is around 10% of your hair: every 2-3 weeks
  • If grey hair is around 20-30% of your hair: every 1-2 weeks
  • If grey hair is around 40% of your hair: every week

After that, you could apply henna only on regrowth area (when grey roots are showing, say 4-6 weeks) until you are ready for a fresh treatment. 
You can purchase henna powder at K’s to apply at home. 

The colour stays rich for 4-6 weeks. Even after the colour naturally fades away, henna stays on and in your hair, and every time you apply, it builds up which makes your hair stronger and more silky.

Unlike chemical hair dye, Henna’s colour is unique to each individual as it reacts to your natural tone. (It doesn’t override like chemical hair dye.) Therefore, it is hard to predict the finished colour. In other words, henna blends well with your existing tone and your hair will look natural.

No. Darker coloured hair won’t change colour or tone significantly. Henna acts like a tinted manicure, so its colour shows on grey or bleached hair well, however, darker parts won’t undergo significant colour changes. It just give your hair shine and body.

Yes. However, switching to chemical colouring after applying several henna application may require some time and skills.
You can bleach & chemically dye  hennaed hair, but the result may not be exactly what you desired. It depends on how much henna remains in your hair.
Therefore, it is better to do chemical dye or bleach  in a couple of months of your 1st henna application.

Allergic reaction to pure henna is extremely rare, however, henna is all-natural, so some people have an allergic reaction to it. If you are concerned, we strongly recommend to do a patch test 48 hours prior to application.

In our salon, the leave-in time is around 25 min. (We use microscopic mist machine to shorten the process time.) 
At home, we recommend to leave it for at least 45min.
We conduct head massage, henna application, rinsing, hair conditioning and blow dry. It makes the whole process  between 90 and 120 min. (Depends on the hair length.) 

No. Don’t worry. Henna oxidises and gets darker and looks natural in a couple of days post application.  
Please note that the more you apply, the thicker henna layers get on your hair. That means the colour may look darker on the area. To avoid it, you can apply henna on the regrowth area only for a while and control the tone.

If you applied 100% henna  and get itchy scalp, it may be because you have dandruff. As henna is active against fungal and yeast infections (which causes dandruff) and the skin exfoliates.
Otherwise, its more likely a temporary allergy from “indigo” (which is mixed in brown/soft black henna), as its leaves have small pointed prickles.
Please rinse your scalp well with hot water, then discomfort should ease.

If your hair feels dry or crunchy, that’s because the cuticle was slightly raised by moisture and lawsone from the henna paste migrating into your hair.
Your hair is not actually dry or damaged.
If it annoys you, please use conditioner. In a few days, the cuticle scales will settle down and your hair will feel smooth again. (usually smoother than ever before).

Not all the same. K’s carefully sourced the highest quality henna
for you to make the most of its benefits.

In most cases, non-desired results come from poor quality henna. (Unfortunately, the packages say ‘organic’ or ‘chemical-free’ but not all really are). Good quality henna powder is genuinely made from “leaves” while some henna products contain other parts of the plants or soil and even chemicals.

The company we import the henna and other herbal products to use with henna from, primarily focus on quality.
They purchase the best quality raw material instead of powder, as they can control and oversee the quality that way, at the best time as per yearly consumption, and filter any extraneous sand during the cleaning process, then store it in their warehouse in proper condition.

They even conduct the lawsone (the property to stain hair) content testing of natural henna once a year to maintain the same quality, & other parameter percentages (like purity, lawsone, moisture etc.) in their in-house laboratory throughout the year.
Finally, their henna is vacuum sealed and packed in an alloy-lined bag (sheltering it from sunlight) to maintain freshness as much as possible.

Would you like to try Henna for your beautiful, healthy hair & scalp ?