Note that this product doesn't lift as quickly or as effectively as 30V; But 20V left my per-treated hair undamaged. This applies easy, good value for price, and plays nice with other products. Minimal smell, and will itch if you accidentally get it on scalp during use.
*Additionally, if you need something to remove colour, and open cuticles to deposit a new one, I recommend this; No bleach needed. Even got out faded red!