Should I Use 30 Or 40 Volume Bleach?
The choice between 30 and 40 volume bleach depends on the desired result and current hair condition. 40 volume bleach is stronger and can lighten hair more quickly, but may also cause more damage and should only be used on healthy, unprocessed hair. 30 volume bleach is less harsh and a better option for finer or processed hair. It’s important to follow instructions carefully and conduct a strand test before applying bleach to the entire head to minimize damage.