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The most fascinating part of this dye is how it reacts to your environment. A color change is typically triggered when the temperature hits between . Real-world triggers include: Sunlight and natural warmth from your head. Heat tools like hair dryers or straighteners.

, such as moving between hot and cold rooms or even wind passing through your hair. the unseen hair dye buy

, including the flash from a mobile phone camera. Why It’s a Game-Changer for Dark Hair The most fascinating part of this dye is