When highlights have taken on a greenish tint due to exposure to chlorine, Loreal recommends using their Metal Detox treatment, which they promote and believe to be highly effective in this situation. It’s important to address the issue of green highlights before considering any additional colouring.
If you feel that colour correction is necessary or if the client desires a toner to neutralise the green tones, Loreal suggests using Dia Light with shades that contain gold and copper tones. For instance, you could use a shade like 8.34, which has a combination of these warm tones to help counteract the greenish hue in the hair. Follow the product’s instructions for application and processing times to achieve the desired result.