When it is proved that the patient is under the influence of black-magic then take 11 strings of blue colour threads equal to the full length of the patient. Make 4-folds of these strings and tie a loose knot at one end of this folded strings. Now recite the whole Surah Falaq, once and blow on the knot and tie it tightly. Make eleven knots in this manner in these strings and put then in blazing charcoals. If the thread burns with a smell, repeat this process daily till the threads starts burning without any smell or odour.