What happens to red hair when it is in chlorinated water?

== == == == I have natural light red hair and if i swim too often in chlorinated pools without using special shampoo after my hair will turn a tinge of green. Wetting your hair in normal water before hand helps too absorb so much chlorine, and using tomato sauce in your hair helps to get the colour green out if your hair changes colour.

From what I can find out natural or dyed red hair is resistant to colour change in chlorinated water. However as chlorine is a bleaching agent the colour will fade if you swim a lot with unprotected hair.