Garnier Olia Permanent Hair Colour - Soft Black

Follow the instructions on the product packaging, usually around 30 minutes. The exact time may vary based on your hair type.

Yes, a strand test is recommended to determine how the color will look on your hair and to ensure you are not allergic.

The formula is ammonia-free and designed for scalp comfort, but a patch test is still recommended, especially if you have a sensitive scalp.

You can reapply the dye when your roots grow out or when the color fades. It is generally recommended to wait at least 4-6 weeks between applications to avoid damaging your hair.

Yes, but results may vary. It's always a good idea to perform a strand test to see how the color takes.

Use a clarifying shampoo to help remove some of the dye. If the color is still too dark, consult a professional stylist.

If you have short to medium length hair, one box should be sufficient. For longer or thicker hair, you may need two boxes.

Ensure even application, paying close attention to the roots and grey areas. Make sure you've followed the instructions for processing time.

Rinse immediately and discontinue use. If irritation persists, consult a dermatologist. Consider doing a patch test before next use.

Use color-safe shampoo and conditioner. Avoid excessive washing and protect hair from direct sunlight.