Do a strand test before colouring your hair. If your hair is damaged, coloured or chemically treated, it will take on colour faster. If its healthy or thicker than normal, it will take time to absorb colour. Do not use heavy conditioners or styling products a few days prior to colouring. There are dye removers available too, to remove colour from your dyed hair.
Vegetable dye is supposedly the most enric hing treatment of all.
It does not lead to any chemical reactions as it nourishes naturally, binding to hair to impart colour. You have the choice of only conditioning your hair or actually giving it a rich maroon hue. The other colouring ingredients are normally full of chemicals that can be enjoyed only temporarily and are usually harmful in the longer run. However it is suggested that Henna buildup can dry hair and cuse it to be heavy and hard to manage. Do not use if you are allergic to any ingredient in the product.