Coloring your hair for the first time
There are a large number of hair coloring products available at various stores such as drugstores. Those labeled hair color (quasi-drug) are often used to lighten dark hair or completely cover gray hair.
Features of hair color (quasi-drug)
A product package displayed at a store contains two agents. The 1st agent (colorant) contains oxidative dyestuff and alkaline agents, while the 2nd agent (oxidant) contains hydrogen peroxide.
Ingredients in oxidative hair dye
Coloring mechanism oxidative hair dye
When coloring hair, you can lighten the color of your hair or cover gray hair by mixing the 1st and 2nd agents and applying this coloring mixture to your hair. (Aerosol hair color products do not require you to mix the 1st and 2nd agents)
There are different types of hair coloring products
There are various types of hair color products. Some are suited for coloring all hair, and others are suited for coloring newly grown hair. Before making a purchase, read the label on the product package and choose a product that is right for you.
Read the warnings and cautions for use on the product package.
Every hair color has warnings and cautions for use listed on the package. Be sure to read these before using the product.
The following warnings are written on the front of the package found at drugstores.
- Never use this product if you have ever developed an allergic reaction caused by oxidative hair dyes.
- Oxidative hair dyes may cause an allergic reaction.
- Perform a skin allergy test (patch test) every time before coloring your hair.
- Please read the entire instruction leaflet carefully before using. Always use the product correctly.
- Oxidative hair dyes may cause severe allergic reactions in rare cases.
- Perform a skin allergy test (patch test) every time before coloring your hair.
- Never use this product if you have ever developed a rash caused by oxidative hair dyes.
Oxidative hair dyes can cause allergic reactions in rare cases depending on your body and skin condition. Such reactions are mostly due to the oxidative dyestuff contained in the product. Even with products that you have used safely in the past, allergic reactions can develop suddenly. Perform a skin allergy test every time before using.
Perform a skin allergy test 48 hours before coloring your hair.
A skin allergy test is the most effective way for customers to check for allergic reactions to oxidative hair dye itself before coloring. Even with products that you have used safely in the past, allergic reactions can develop suddenly. Perform a skin allergy test every time 48 hours before each use of hair color. Apply a mixture of the 1st and 2nd agents to the underside of your upper arm. Observe the area 30 minutes after application as well as 48 hours later.
*During the skin allergy test, if you experience any skin reactions such as a rash, redness, itching, blisters, or irritation in the applied area, do not rub the skin with your hands. Immediately wash the test area off and do not use the oxidative hair dyes. The same applies if you experience similar skin reactions sometime before the 48 hours is over.
Learn about allergic reactions to oxidative hair dye
Oxidative hair dyes are safe to be used if you read the instruction leaflet carefully and use them correctly. However, depending on your body or skin condition, allergic reactions may develop. Even with products that you have used safely in the past, allergic reactions can develop suddenly like hay fever. Repeated use while failing to notice an allergic reaction may lead to a severe allergic reaction. In the unlikely event of an allergic reaction, seek medical attention.
