What year did madam c j walker invent a perm?

Answer #2: Madam C. J. Walker did not invent chemical perms or chemical straighteners and did not include those products in her line of hair care products. She developed a system for teaching hair care and for grooming black women's hair through the company she founded in 1906.
Source: On Her Own Ground: The Life and Times of Madam C. J. Walker

Answer #1:so that black woman can have straight long hair like white women