Permanent tint 100ml + 100ml 20vol developer Processing time is 20-40mins for full deposit Designed to be used on pre lightened hair or level 8-10 hair Lifting 2-3 levels on fine hair and 1-2 levels on resistant hair full grey coverage Check color development every 5-10 mins ** Please note, hair dye does not lift hair dyes** Light shades mixing ratio is 1 part tint, 2 part developer. 1-1 can also be used on extremely resistant hair. Test strand should be done to determent mixing ratio