Final answer:
To neutralize brassy gold tones after prelightening hair, a blue or violet-based toner should be used. The toner counteracts the brassy color and achieves a more natural hair tone. The product's instructions and a color chart should be consulted for best results.
Step-by-step explanation:
To neutralize a brassy gold effect after prelightening a client's hair, a toner should be selected, specifically one with a violet or blue base. These colors are opposite of gold and orange on the color wheel, and therefore counteract the unwanted brassy tones.
After prelightening, hair can often lift to a warm yellow or gold, making it essential to use a toner to achieve a more natural or desired cool tone. It's important that a professional stylist evaluates the level of brassiness to recommend the appropriate level of toner, as over-toning can lead to unwanted hues in the hair.
For best results, follow the product's instructions carefully and consider consulting with a color chart.