I have wavy hair so finding products that are gentle are a top priority. I used to apply semi permanent color but since I'm getting more grays I had to switch to something permanent. I did a lot of online research and Henna is what I chose. It's natural, permanent, and most users found it strengthen and added shine and manageability to their hair. Henna is difficult to apply. I recommend having a friend on board to help. Doing it outside is a bonus. Have a cape or use a garbage bag to protect ski and clothing. We used hair clips to section off the hair (use as a many as you can). Start at the nape and as close to the scalp as you can. If you dont, it's difficult to go back and fix. Break the henna up in smaller bricks. Use the entire block...do not try to use less because you do not want to try melting more as you are in the midst of application trust me. Either use boiling water or simmer over double boiler. The batter will end up looking like a thin brownie batter. Use gloves. Work in small sections of hair, take your time as its easy to miss patches of hair and once it stiffens in your hair it's almost impossible to rework the hair. Keep some warm water on hand if the mix thickens. Having a friend to apply is almost mandatory. Once application is done let set for at least 4 hours (8 is better). Rinse out in the shower. It takes a good half hour to penetrate the hard shell of henna encasing your hair. Do not fear it does come out be patient. Use a deep condition after. The application is horrendous and long but the color was fabulous and my hair was very soft after.