1. With foam hair dye, it can be applied to the hair more evenly and easily colored.
2. Apply hair dye in different regions and in different layers to increase the dyeing effect.
3. Apply hair dye from about 5cm away from the scalp to avoid hair dye contacting the scalp.
4. Appropriately increase the standing time to make the hair dye stay on the hair for a longer time, thus improving the dyeing effect.
5. After dyeing, heat your hair with a hot towel or hair dryer to make it easier to color.
The above techniques can improve the dyeing effect of sideburns. Please feel free to let me know if you have any other questions.