I used to be a bottle redhead,red hair, now my hair is purple.
That's awesome! My sister and brother both have red hair, but I was the only kid born with brown hair. I died my hair purple 10 years ago though!
Red hair occurs naturally in 1--2% of the population.  Purple, never!!
I didn't know that! In my family it was more like 66%, which is crazy, because neither of my parents have red hair. 
Red hair has a genetic base  It is most common in people with two copies of a recessive allele on chromose 16.
What is a recessive allele?
A recessive allele is a part of a chromosome.