30 Vol vs. 40 Vol Bleach: Understanding the Differences for Hair Lightening
Bleaching your hair is a transformative process, capable of turning drab locks into vibrant, head-turning styles. However, it’s also a process that demands respect and understanding. Choosing the right developer volume is paramount, and the decision often comes down to 30 volume (30 vol) and 40 volume (40 vol) bleach. But what are the actual … Read more