hoyu Singapore

How to Use

  • Lightness of Color

    Core principle of coloring your hair: avoid picking the wrong level of hair color.
    Level refers to the degree of lightness or darkness of a color.
    This is more important than picking the wrong color!
    It’s easy to darken a shade that is too light, but lightening a dark color is not possible.

  • Type of Hair

    The end result of the hair coloring process varies based on the characteristics of the hair itself.
    Thin, soft and easily-permed hair is easy to color, while thick, stiff hair that is difficult to perm is harder to color.

  • Skin Tone

    (same as shown in "4. Choose shades based on your skin tone")

  • Number of Boxes to Use

    Most of the products can cover short to medium length of hair.
    Please note that if the amount of hair dye applied is too little, this may cause unevenness in the result, and those who have a lot of hair or thick hair require more hair dye.
    It is advised to use two boxes for long hair or thick hair.

  • Mix of Colors

    As mixing two different hair colors together will not result in the color in the middle.
    It is definitely not recommended to mix two different hair color dyes together.
    This is due to the difference in chemical compounds for each product.
    It may result in a strange shade, or even worse, may cause severe damage your hair.

  • Skin Allergy Test

    The Skin Allergy Test is a test for allergic reactions to ingredients contained in the hair dye solution.
    Conducted 48 hours before coloring your hair, please carry out the skin allergy test to check whether there are any adverse effects resulting from the application, before actually dyeing your hair.
    Please refer to the following link for further assistance.

  • Perming and Coloring

    In case you would like to enjoy both perming and coloring, please perm your hair 1 week prior to coloring your hair.
    Hair color tends to fade, if it is done before a perm.
    Please note that if you color your hair after perming, you may lose some of the curl.

  • On Wet Hair or Dry Hair?

    Please apply dye to dry hair only.
    If the dye solution is applied to wet hair, the water might dilute the solution and cause dripping into your eyes.
    As this can be quite dangerous, please blow dry wet hair first before using hair colorant.

  • Shampoo before Use

    You generally shouldn’t shampoo immediately before coloring because this will remove the natural oils that protect your scalp during the coloring process.
    Even if the hair is a little dirty or has some styling product residue, there should be little influence on coloring. Only if there is a large amount of wax or oil residue, then it is best to wash it all off, taking care not to damage or scratch the scalp in the process. It is best to shampoo your hair the day before you plan to color it.

  • Hair Sectioning

    In case you want to dye long hair, or the back of the head/nape, hair sectioning will make it easier to apply dye to the hair.
    You should separate hair vertically into 4 sections and put each section up to be ready for coloring.

  • For Darkened Hair

    Due to the permanence of hair colorants, lightening a dark shade of color is extremely difficult.
    The best way would be to simply wait for new hair to grow, or otherwise wait for the color to naturally fade. Visiting hair salon to ask for consultation is also an option.

  • Hair Sectioning

    In case you want to dye long hair, or the back of the head/nape, hair sectioning will make it easier to apply dye to the hair.
    You should separate hair vertically into 4 sections and put each section up to be ready for coloring, and start applying from the nape. After applying back sections, move onto the front sections from the bottom upwards.

  • Amount to Apply

    "For places that are hard to color, one should generally apply more solution.
    The human head has different temperature zones.
    Naturally, this also affects the coloring process.
    Varying the amount of hair color solution applied for each area would help to avoid unevenness in the result.
    As gold and blond bleach solution accumulates easily in the root, this may result in unevenness as well.
    To counter this, apply the solution 1~2cm above the root of the hair."

  • For Perfect Gray Coverage

    Start applying the hair dye to the areas where gray hair is concentrated.
    It is also important to make sure adequate amount of the solution is applied to these parts.

  • For Thick and Firm Hair

    As thick hair is naturally hard to dye, it is recommended to let the hair color stay on for slightly longer than stated on the product instruction sheet, depending on the thickness of your hair.

  • For Damaged Hair

    Damaged hair tends to be quickly colored.
    Please apply the hair color to the healthier part first and distribute the solution to the damaged hair after a while.

  • Developing Time

    Your hair will normally become darker as the color sits on it longer.
    However, leaving color solution on hair for too long could damage your hair and make your scalp itchy.
    Please keep to the time stated in the instructions.

  • Darker than Desired Color?

    The next time you color your hair, use a lighter color. In order to prevent your hair from becoming too dark, you can also leave the hair color on for a shorter period of time to control the darkness.
    In the meantime, please note that, even though the hair might look dark right after the dyeing process, it might become the desired tone after a week or so due to fading.

  • Want to Change Your Color Again?

    While you can darken your hair from a light hair color, it may be difficult to lighten hair after using a dark hair color. Moreover, please wait for at least a week before coloring your hair again to avoid any excessive damage to your hair.

  • Frequency of Hair Color

    Hair grows by about 1-1.5cm each month, so regular hair coloring will keep your hair looking vibrant and beautiful.
    For gray hair, we recommend that you recolor your hair once a month, once the gray hair becomes obvious.
    This practice will allow for better matching between the newly-dyed hair and previously dyed hair, while minimizing any cumulative damage to the hair.

  • Color Fading

    Color fades faster with frequent shampooing and prolonged exposure to ultraviolet rays/heat. When shampooing, the dyes in or around your hair would drain out with the water.
    If you're used to washing your hair everyday, try washing it every other day instead. Trying a dry shampoo in between is also an option. Covering up with a hat or umbrella when going into the sun could also help as exposure to UV light or heat will also lighten your hair color over time.

  • Dry Hair after Wash

    "Avoid leaving your hair wet after washing.
    The hair is especially prone to damage during the week after coloring.
    Rubbing your hair with a towel vigorously after shampooing will cause friction and damage between the hair strands. Instead, remove moisture gently by pressing sections of hair in a towel.
    Moreover, the color may stain your clothing and bedding if they come into contact with your wet hair. However, blow-drying too much may also cause dryness and damage to the hair."

  • Type of Hair Care Products

    It is recommended to use shampoos, conditioners or treatments made specially for color treated hair to maintain the vibrancy of your hair color.
    Normal hair care products may strip hair color.

  • Styling Products

    Products like mousses, sprays and mists will not cause color fading.
    However, using hair tonics and other hair growth products may, on rare occasions, fade your hair color.
    We recommend avoiding usage of these products within 1 week of coloring your hair.

  • Perming after Coloring

    We recommend letting your hair rest for a week after a hair color session.
    Do take note that perming may cause color fading.

  • Hair Mascara

    Do shampoo your hair after use of Hair Mascara before going to bed.
    If the colorant is not washed off, it may transfer onto your pillow case or other parts of your bedding.

  • Expiration Date

    Our product is good to use for at least 3 years from its manufacturing date, as long as it is unopened. As actual expiration dates are varied depending on the product line, please contact us directly to know if any particular product can be used even after 3 years.

  • Smart Saving

    "Hair color cannot be stored once the components have been mixed together.
    Please ensure that the remaining mixture is washed off and discarded immediately.
    However, the products that come with 2 tubes and stored respectively unmixed can be used for 3 months even after opening.
    Moreover, the aerosol type of products can be used for 6 months after opening.
    The color of chemicals may change when exposed to air, but rest assured that it will not affect the dyeing process."

  • Itchiness on Scalp

    We recommend to discontinue use of hair color if you feel itchiness during hair coloring, as there is a possibility of an allergic reaction.
    Even if it is just itching that you’re experiencing, there is a high chance of an allergic reaction if it has been happening with every use. Avoid any further usage.

  • Allergic Reaction

    Please do not use hair color again once you experience any allergic reaction.
    Just one allergic reaction is enough for the body to identify the colorant as a foreign substance.
    Any subsequent contact with the colorant will cause another similar allergic reaction. In extreme cases, continued usage may accelerate symptoms and cause a severe allergic reaction.

  • Coloring during Menstruation or Pregnancy

    It is not advisable to use hair color during menstruation, pregnancy, or when there is a chance of pregnancy.
    This is because an allergic reaction may be caused resulting from the body’s hormonal changes.
    The skin also becomes exceptionally sensitive and prone to irritation during menstruation and pregnancy.
    Please do avoid coloring your hair during these periods.

  • Use on Children

    We request that you refrain from using hair dyes on children.
    The scalp and hair of a young child/infant is more sensitive than that of an adult’s.
    With less sebum production, a child has less protection from irritation.
    We strongly request that you refrain from using hair dyes and bleaches on young children and infants.

  • Use on Facial Hair

    Please refrain from dyeing areas other than intended (i.e. hair on scalp).
    The skin around the eyes and mouth is more delicate and sensitive, and hence prone to irritation.
    It is also dangerous as the chemicals may come into contact with your eyes.

  • Coloring after Shaving

    We recommend you to refrain from coloring right after shaving your facial hair, as freshly shaven skin might be especially prone to irritation from the dyeing chemicals.

  • Taking a Bath during Coloring

    We recommend not to take a bath while dyeing your hair. The dyeing chemicals may get into your eyes as a result of sweat or steam, and hence may be unsafe.

  • Contact with Eyes

    If the dyeing solution comes into contact with eyes, immediately rinse well with cold or lukewarm water for at least 15 minutes while making sure never to rub them, then consult an eye specialist. Avoid attempts to self-medicate with eye drops.

  • Accidental Ingestion

    In case a child drinks the dyeing liquid by accident, be sure to first let the child drink some water or milk regardless of the amount of dyeing liquid consumed, and bring him/her to seek medical treatment immediately.

  • Stains on Skin

    "Hair color on the skin will eventually fade after a few days as the skin renews itself, and as you shower and shampoo your hair.
    To quickly remove the stain, use cleansers like makeup removers. Let the cleanser sit on the stain before gently massaging it for a minute or so.
    Then, steam the area by placing a warm, damp towel on top before washing with a bar soap. You can also do so by applying soap on a towel and using it to lightly rub the stained area.
    Be careful not to rub too hard as it may cause damage or inflammation of the skin.
    Be sure to wear gloves during the dyeing process as hair dye stains cannot be removed from fingernails."

  • Stains on Clothes

    The color may transfer onto shirt collars or the inner lining of caps if soaked from rain, sweat, or from swimming. Please avoid wearing white or lighter-color clothes after coloring.
    The stain may only be removed using chlorine bleach.

  • Stains on Floor

    "For absorbent materials such as parquet flooring, carpets, tatami mats, wallpapers and leather, immediately wipe off excess, then clean using a neutral detergent.
    Unfortunately, any stain left over from the previous step is likely to be permanent.
    As a preventive measure, we recommend covering the floor with newspaper before your dyeing process. Refrain from using thinners and nail polish removers as well.
    They are ineffective in removing the stain, and may also damage the surface."

  • Stains on Sink

    "The hair dye stain will become harder to remove the longer it is left to sit. However, it can be lightened with the use of a melamine sponge, or some chlorine bleach.
    As the use of either may damage the affected surface, we recommend to consult the sink/bathtub manufacturer before doing so.
    For smooth surfaces that are hard and waterproof, but also prone to getting scratches, a viable option would be to use a melamine foam sponge. However, refrain from doing so on mirrors with an anti-condensation coating as it may cause scratches to the surface.
    For materials that are waterproof and have an uneven surface, soak either a cotton pad or a kitchen towel with a chlorine bleach dilution.
    Let the cloth sit on the stain for about an hour, then rinse with water.
    However, chlorine bleaches may affect the color or quality of the surface. We recommend to test it in an inconspicuous area before use.
    When using melamine sponges and chlorine bleach, please follow the respective user guidelines as provided."