True pastel blue shade Semi-Perm 7-24 washes Most vivid on level 10 hair Sky High is part of our Lighter Daze collection. Lighter Daze dyes should always be applied to level 10, platinum blonde hair to achieve the best results. Semi-permanent hair dye combines salon-grade pigments with a nontoxic formula that deposits ultra vibrant color. Our semi-permanent hair dyes do not damage the hair, in fact they’re super conditioning with a high-quality cream base that acts like a hydrating hair mask with essential oil benefits.