How do you get the color out again?

Hello,

Unfortunately, my cotton lab coat became discolored while washing in the washing machine and is now pink…

I also washed the coat once more, this time without any other clothing, and tried using chlorine detergent, but unfortunately the color doesn't come out anymore….

Sure, it's just a lab coat, and it might eventually develop stains that won't come out, but mine is now completely pink….

Does anyone have any idea how to make the coat white again?

I would be grateful for any tips.