Final answer:
Single process tints usually contain a lightening agent, a shampoo, an aniline derivative tint, and a toner. Toning is an important step in achieving the desired final hair color.
Step-by-step explanation:
Single process tints usually contain a lightening agent, a shampoo, an aniline derivative tint, and a toner. A toner is commonly used in hair coloring to adjust the shade or tone of the color. It neutralizes any unwanted brassiness or yellow tones in the hair. Toning is an important step in achieving the desired final hair color.