Bleach turned white shirt's collar BRIGHT pink!!!

[JemimaBee]

Since my favourite white shirt's collar was getting yellow, I decided to bleach it to restore the original whiteness. As soon as I soaked the shirt into the water+bleach solution, the collar turned BRIGHT pink!! The shirt has been soaking for 2 hours and the pink does not look any less intense.

I read online it may be because of some chemicals in the sunscreen I use? Has anyone any clue about how to get rid of the pink? There must be something I can do.

That's my favourite shirt, I can't bin it

PLEASE HELP!!!!!