1. Choose the right henna powder: For a natural and effective hair dye, pick body art quality henna that is 100% pure and free from chemicals, additives or synthetic dyes.

2. Measure the henna: Depending on your hair length, measure out the necessary amount of henna powder into a non-metallic mixing bowl. Use approximately 50g for short hair, 100g for medium-length hair, and 200g for long hair.

3. Add lemon juice: Slowly mix in freshly squeezed lemon juice to the henna powder. You can also use orange or grapefruit juice as an alternative. The acidity helps release the dye from the plant molecules.

4. Mix to the right consistency: Stir the mixture well until it reaches a smooth, yogurt-like consistency without any lumps.

5. Let the dye release: Cover the mixture with plastic wrap and leave it at room temperature for at least 4 hours or overnight for better dye release.

6. Prepare your hair: Before applying henna, make sure your hair is clean and free from oils, dirt, and any other products. Detangling your hair will also facilitate an easier application.

7. Protect your skin: To avoid staining your skin during application, apply a thin layer of petroleum jelly or natural oil along your hairline, ears, and neck.

8. Wear gloves: Put on plastic gloves before starting the application process to prevent staining your hands.

9. Divide your hair into sections: Parting your hair into small sections allows for even distribution of henna throughout your head.

10. Apply the henna paste: Using an applicator brush or your fingers, start applying the henna paste from the roots to the ends of each section of hair.

11. Pile coated sections on top of one another to ensure full coverage and wrap up in plastic wrap or a shower cap to keep the henna intact.

12. Allow it to process: Leave the henna on your hair for 2-4 hours, depending on the desired color intensity. Keep in mind that henna takes longer to process than most commercial hair dyes.

13. Rinse and condition: Finally, rinse your hair thoroughly with lukewarm water, followed by a gentle conditioner. Avoid using harsh shampoos for at least 48 hours as this may strip the henna from your hair.

By following these 13 steps, you can master the art of mixing and applying henna to your hair. Enjoy your natural, vibrant, and chemical-free new color!