Redken Color Cover Fusion Hair Dye:

Redken Color Fusion Advanced Color is a permanent dye that beautifies natural color results. Color Fusion penetrates the hair shaft to deposit hair color molecules deep within. It's great for covering gray hair up to 100% with multi-dimensional hair color that stays true-to-shade. Delivers durable, delicate tones that are never flat or opaque It can be used to lighten, darken, match natural hair color, and cover grays.

Mix in equal parts with a developer (not included).  Processing time is 45 minutes.

ATTENTION: This product requires professional expertise. The seller is not liable for any adverse outcome resulting from the use of this product.