Green Hair After Henna: Why It Happens and How to Prevent It

Have you noticed a green colour or a cool greenish tint in your hair after natural colouring? Do not worry. With plant-based colouring, the result can develop gradually and often depends on the right technique, your original hair colour and the blend used.

At VOONO, we specialise in natural hair colouring, so we know that a greenish tint is most often connected with very light hair, grey hair or an unsuitable shade choice.

Why can a green tint appear after henna?

Henna itself usually colours the hair in warm tones – copper, auburn, red or chestnut. A green or grey-green result is more likely to appear with blends that contain indigo. Indigo helps create brown and darker shades, but on very light, lightened or grey hair, it can turn cool if the right base is missing.

A green tint after henna can appear especially when:

• the blend contains a higher amount of indigo,
• the hair is very light, grey or lightened,
• two-step colouring was not used,
• the colour has not had enough time to settle,
• the shade was not chosen according to the starting hair colour,
• the blend was prepared or applied differently from the instructions.

Is green hair after henna permanent?

In most cases, it does not have to be. Plant-based colours can continue developing after application and the final shade may settle over the next several hours. That is why it is not a good idea to panic or immediately recolour the hair with a random blend.

First, give your hair time. Wash it gently, do not overload it and watch whether the shade softens or warms up over the next few days.

How can you prevent a green tint?

The most important thing is choosing the right shade and method. If you have grey, very light or lightened hair and you want a brown or darker result, two-step colouring may be suitable. It helps create a warmer base first and then adds the final darker tone.

These steps can also help:

Strand test
Before colouring, always test the blend on a small strand of hair.

The right VOONO shade
Do not choose your colour only by the picture. Your current hair colour, hair quality and whether you have grey hair all matter.

Following the instructions
With plant-based colours, water temperature, processing time and the right blend ratio are all important.

Consultation before colouring
If you are not sure, VOONO can help you choose the right shade and method.

What should you do if you already have a green tint?

If a green tone appears after henna or plant-based colour, do not apply another random colour straight away. First, try to understand why it happened. The safest option is to contact VOONO for advice or choose the next step according to the specific shade and your hair type. Every hair type reacts differently, so one universal solution may not work for everyone.

Why is my hair green after henna?

A greenish tint is most often connected with indigo, light hair, grey hair or an unsuitable colouring method.

Is green colour after henna permanent?

Not necessarily. Plant-based colour can continue developing after application and the shade often settles over the next few hours or days.

How can I prevent green hair after henna?

A strand test, the right shade choice, following the instructions and, for grey or light hair, often two-step colouring can help prevent a green tint.

Can VOONO help me choose the right shade?

Yes. If you are not sure which colour or method to choose, it is a good idea to contact VOONO and pick the shade according to your current hair colour and hair condition.