Korean Hair Dye at Home: Safety and Label Questions Answered
A Q&A on reading hair dye instructions and understanding U.S. FDA safety guidance before home coloring.
Before buying Korean hair dye for use at home, make sure you can understand the full instructions and warnings for the exact product. Hair dyes can irritate skin and injure eyes. These answers summarize general U.S. Food and Drug Administration (FDA) guidance; requirements and product directions may differ by market.
Should I test the product every time?
The FDA recommends a skin patch test before every use, even if you have used hair dye before, because sensitivity or formulations can change. Follow the product’s accompanying test instructions. A clear test does not guarantee that a later reaction cannot occur. If you have a history of reactions or are unsure about testing, consult a healthcare professional before use.
What should I check before applying color?
- Read every caution and warning and check the ingredient list for substances that have caused you problems.
- Do not use dye on an irritated, sunburned or damaged scalp; ask a professional if you are unsure.
- Use gloves and follow the product directions for mixing, timing and rinsing.
- Do not leave the dye on longer than directed or mix different hair dye products.
- Keep dye away from children and from the eyes.
Can scalp hair dye be used on brows or lashes?
No. The FDA warns against using hair dye on eyebrows or eyelashes at home because it can seriously injure eyes, including causing blindness. A hair dye label or shade name does not make it suitable for use around the eyes.
How should I choose a shade online?
Compare the manufacturer’s shade chart and instructions for your starting hair color, and ask the seller for a complete legible ingredient list and directions if the listing omits them. Results vary with your hair and prior treatments; a screen image is not a guarantee of the final shade. For general shampoo and conditioner directions, see THE CAST’s related hair-care guide below.
If you experience a reaction, stop using the product and contact a healthcare professional. A product’s Korean origin does not by itself establish that it is safe or appropriate for you.