Final answer:
If there are still dark spots on the hair shaft after lightning, you can apply a toner to neutralize the remaining pigments.
Step-by-step explanation:
If there are still dark spots on the hair shaft after lightning, you can apply a toner to neutralize the remaining pigments. Toner is a hair color product that helps to balance out unwanted tones, such as brassy or yellow colors. It can be applied after the lightning process to achieve the desired shade.
For example, if someone had dark brown hair and wanted to lighten it to a blonde shade, but ended up with some orange or yellow tones, a purple toner could be applied to counteract those colors and achieve a cooler blonde result.
It is important to note that toner should be applied carefully and according to the product instructions, as using it incorrectly can lead to undesired results.