Hair and hydrogen peroxide (HELPP !)?

my friend and i have to do a science fair project and our teacher required us to interview a professional about it. we couldnt find anybody to interview and were kinda doing it last minute soo please help us!

1.In your experience, what hair color reacted best to bleaching solution?

2.How can you tell the difference between damaged and healthy hair?

3.What鈥檚 the range of the percentages of the hydrogen peroxide that people usually use to bleach hair?

4.What shampoo brand would you recommend to use before bleaching hair to get the best result?

5.Does ethnicity of hair affect the result of bleaching hair?

6.How much harder is it for a person with darker hair to get the same result as a person with lighter hair?

7.Does the type of shampoo affect the process of bleaching?

8.When do you think the trend of bleaching hair began?

some of the questions are very obvious.

Hair and hydrogen peroxide (HELPP !)?

srrry but all i kno is that hydrogen peroxide disolves hair and the darkder the hair the harder it is to bleach