Blue color in salt

Can anyone tell me why blue color problem occour in salt?

1. Ufuk Ayyıldız reply

   Can you share a photo ?

2. zynpas reply

   I dont have a photo. I only want to know if it is related with salt chemical structure or not.

3. Ufuk Ayyıldız reply

   i think it is about chemical content and PH. see table on below link https://chemistry.stackexchange.com/questions/33915/how is persian blue rock salt made

4. B.kumar Food Consultancy Services reply

   If you keep salt in copper pot, than copper sulphate can be developed which is green colour