First, mix up some golden-coppery tones close to the level or the darkness of the brown you're searching for. Apply all over your red and gold. Due to this, blonde hair can get a bright green tint if colored brown. Applying cold color shades on bleached hair gives the result of greenish tone. Anyone who has ever dyed their hair before will know that hair dye fades. A lot. This goes for brown hair dyes too. If you've got years of bleach under there, it won't. From dark brown to platinum blonde: how long does it take to dye, how many sessions, how much does it cost to make a dramatic hair.