How I corrected a patchy balayage without further damaging the hair

It happened to me during a normal shift, inside the salon with clients arriving with mixed previous formulas and very light reference photos: a balayage ended up with orange bands and porous ends after a previous bleaching. The symptom that made me investigate it seriously was that the hair was lifting unevenly, the roots were healthy, and the mid-lengths/ends were absorbing toner too quickly. I…