Purchase a paint, preferably a professional. It is better to discolor the hair, as well as less traumatic effect on the structure and hair follicles. If you cannot find the required drug, consult with an experienced hairdresser. By the way, to lighten the roots can be in the beauty salon that is much more preferable.
If you use regular paint, dispense half of the money from each tube in a porcelain or glass bowl, mix thoroughly. You need to use immediately. If you have acquired a professional clarifier, the required proportions refer to the instructions for use.
Put on gloves and proceed to the discoloration of the roots. Start apply the mixture with the back of the head, trying not to fall on previously colored hair. For ease of application use a special wide brush, not a toothbrush or applicator bottle. If you are not able to carry out such a procedure, ask someone close to help you.
Note the time required for staining. 5-10 minutes before you will need to wash off the paint, and spread it throughout the length to refresh the colour of hair. Don't forget to apply a nourishing balm that softens bleached hair and nourishes throughout.
If you have very thick and bushy hair, breed packing the paint, and not half, as recommended by manufacturers. The staining professional clarifier you will need about 50-60 grams of composition.
Before coloring the roots don't wash your hair at least a day. During this time the hair slightly covered by sebum that will protect them from the negative effects of bleach. Also before the procedure, do not apply the curls styling products and also serums or sprays that do not need to rinse.