Kaveri Easy Fast crème hair color is enriched with black sesame oil, which provides deep color penetration with 100% grey coverage and long-lasting color results in just 10 minutes. Skin Hypersensitivity Test This preparation may cause serious inflammation of the skin in some cases and so a preliminary test should be carried out to determine whether or not special sensitivity exists. For carrying out the test cleanse a small area of skin behind the ear or upon the inner surface of the forearm using either soap and water, or alcohol. Mix a small quantity of colorant and developer, and apply it on previously cleansed skin and allow it to dry. After 48 hours wash the area gently with soap and water. If no irritation or inflammation is apparent, it may be assumed that no hypersensitivity to the dye exists. The test should, however, be carried out before each and every application. This preparation should on no account be used for dyeing eyebrows and eyelashes as severe inflammation of the eye or even blindness may result. Step 1 Hair Preparation- Wash your hair thoroughly and dry them completely. Step 2 Color Preparation- Mix the crème colorant and developer equally in a plastic or glass bowl. Step 3 Application Process- Apply the mixture on washed and dried hair with a brush. Step 4 Application Time For Natural black the application time is 10 minutes and for Burgundy, dark brown and copper red it is 20 minutes. Step 5 Wash and rinse Rinse your hair with lukewarm water and get silky-shiny natural hair.