General FAQ of all Bigen products


All permanent hair colours including Bigen require a skin allergy test before each use. Body constitution and condition are changing every day. An allergic reaction occurs depending on the constitution of the day of use. Please make sure that you do a skin allergy test before each use, even if you have been colouring for years without any problems.

You should carry out the test following the instructions provided 48 hours before application to see if you are allergic to hair colour products every time you colour your hair with a permanent hair colour product. Do not use the product if you notice any burning, swelling, redness, or irritation on your skin.

We recommend choosing a colour shade that is close to your initial hair colour or a lighter colour shade.

You should be able to colour your hair as it is. However, if your hair is exposed to excessive hair styling product build-up, please shampoo the day before application. If your hair has excessive hair styling product build-up or is very oily, you should rinse your hair to be able to obtain the desired colour. Hair styling products and oily hair may prevent the colour from penetrating into the hair shaft.

No, hair colour should be applied to dry hair. Water will affect the colouring process, and the desired result may not be obtained if you apply it to your wet hair.

You may not obtain the desired hair colour if you apply it on hair that has recently been coloured by henna. This is because the colours from henna are left in your hair, and if the colours of BIGEN products and the colours of henna are mixed the results may not be as they were desired. The time it takes for the colours of henna to completely come out differs from person to person, therefore we recommend you wait until new hair has grown in or cut the coloured areas.

Please refrain from colouring your hair while taking a bath or shower. It is dangerous because sweat and steam may cause the mixture to drip into the eyes.

Children have more sensitive scalps than adults and the natural barrier function is also weaker due to less secretion of oils, prone to an allergic reaction. Therefore, you are recommended not to use hair colour or bleach on children.

Please do not colour areas other than the hair on your head. Because the skin near the eyes and mouth is thinner and more sensitive, the skin may be irritated. It is also dangerous because the mixture could come into your eyes. If you would like to colour your beard, please use a Bigen Men’s Beard Colour.

Changes in your hormonal balance when you are having your period or pregnant can make the skin more sensitive, increasing the possibility that you will experience skin irritation. On the other hand, if you decide to use a hair colour product during pregnancy, there will be no negative effects on the child.


No. You can only save the unmixed powder or cream. The unused mixture has to be thrown away after the application.

No. It is not recommended to mix colours. Mixing hair colour is not like mixing paint. The result will not be in between the colours you mix, and also cannot be predicted how it would come out.

No. Colour pigments of permanent hair colour – once oxidised and developed especially dark colour – are difficult to remove from hair. Say, it is almost impossible to lighten previously darkened hair with permanent hair colour by yourself. In such cases, asking for a professional service at a salon is recommended.

Long-lasting colours

The shampoo used should be mild acid shampoo. Ingredients in hair colour working as pH adjuster balances the mixture to alkali, in order to maximise the colouring effect. The pH status of coloured hair(Alkali) should be offset to the original status of hair, which is a mild acid. This is why mild acid shampoo is recommended.

It is recommended to use hair care products for colour-treated hair. Nutrition and pH adjusters are contained in these products. They prevent colour fading and return the pH status of coloured hair(alkali) to the original status(mild acid). In addition, oil, cationic polymer, nutrition such as vegetable extracts, and protein give moisture to the hair.

How long the colours last depends on your aftercare, especially caring a week after colouring is important. The protein substance and colourants come out of cuticles easily especially after colouring, because hair is towards alkalinity and cuticles are opened. If hair is damaged, the colours do not last long.

For long-lasting colours, you are recommended to use shampoo and conditioner designed for coloured hair. Those products have features such as: “rinsing away dirt without damaging the hair”, “working on damaged areas to minimise damage to the hair” and “protection against colour fading”.

Please note that some alkaline shampoos (anti-dandruff shampoo) will cause the hair colour to fade.

Please wait at least one week after your last application. If the interval between applications is less than 1 week, your hair or scalp may be damaged. For covering grey, we recommend retouching/touch-up once a month, because hair grows 1-1.5cm a month and the difference between the coloured area and root area can be seen.

Perm your hair first.

Try to have your hair permed at least one week before colouring your hair. If you perm your hair after colouring, the colour might fade. However, the process of colouring may loosen the curls, so please consult a hairdresser beforehand.

How to avoid / treat stains

During application, please cover your body with a towel or cape and wear gloves to avoid stains, because it is hard to remove. We also advise you to wear something that the stains will not stand out. If any mixture gets on your clothes, please wash them with water immediately because it is hard to remove the stains as time passes.

Removing from the nails: polish the nail using toothpaste and a dry towel. Stains on the skin will generally be removed within 2 to 3 days by the skin’s metabolism if you take a bath or shower every day.

Removing from the skin: quickly apply a make-up cleanser to the area and gently massage the area for 3-5 minutes. Next press a hot towel on the area for 5 minutes to steam and then clean the area with bar soap. Rubbing the area with soap on a towel is also effective, but do not rub too strongly or you will damage the skin.

If the shampooing is not sufficiently done after application and your hair is wet, the colour pigments left on your hair’s surface come out and stain your pillowcase. Therefore, please shampoo your hair well (recommended twice), apply conditioner and dry your hair thoroughly before you sleep. Please be careful for about a week because colours may transfer onto clothes and pillowcases after sweating a lot while playing sports, getting wet because of rain, and using hair tonic.

In reality, there is no way to remove stains from the area for materials that absorb the mixture like wooden floors, carpet, tatami mats, wallpaper, and leather. We recommend putting down some newspapers to protect against spills.

If the mixture falls onto plastic flooring, quickly wipe up the mixture and wash the area with a neutral detergent. If the area has already been stained, the stain can be removed with diluted chlorine bleach on absorbent cotton, however, this may damage the wooden floor material and cause the colour to change.