shopping time for dolls with hair :)

okays i went to the shops and got 4 dolls that are all the same. now i just have to buy the different brands of hair dye and than i can start my experiment :)

variables

control, about of dye used, type of doll and how many times washed

my ideas

i have came up with a number of ideas and after ms' help i have decided to go with the idea of ' which brand of hair die lasts the longest'
i am going to test this by buying some dolls and dying their hairs with different brand names of hair dyes and wash at the same amount of time ect