The biological perm liquid produces surprising results, it has particularly strong conditioning effect, which makes the hair particularly soft and natural, because it contains amino acids, which incorporate into the damaged hair structure, and protect the hair from the harmful effects of technological interventions. It also includes acid control, which helps to keep an optimum level of acidic pH value in the scalp and hair. There are two types of amino acid BI'ORISING perms available for professionals: N'1 for normal hair, N'2 for dyed and weak hair. Package: 250 ml