You should never use 40vol on relaxed hair or any hair. Its only for making specific formula strengths... It burns the melanin out of your hair "quicker" should have use 30 or lower
Why did you leave it for 2 hrs ?? 😭😭😭 relaxed hair processes faster than natural hair , it would’ve been vibrant sigh .. I wish to see how your hair looks now.. the color is beautiful on you tho