The Maria Nila Bleach Collection Developer 750ml 12% 40 Vol is a professional hair bleach specifically designed for demanding lightening processes. With a concentration of 12% and 40 volume, it provides effective and controlled lightening, making it ideal for use with the Maria Nila Bleach Collection. The product comes in a convenient 750ml bottle, allowing for easy application and dosing. A successful model among proven bleaches, it gently supports hair health during the lightening process.