pink or not. If you fill a bowl of salt, add a little water, then do nothing. Have a look after a month or two, maybe less if its hot.
The good salt will grow out of the bowl, like a crystal grid. You can see it with the bare eye. The not so god salt will stay in the bowl, have more square shapes, like a coffin box.
If you do three batches, like himalayan, celtic and table salt , my guess is that you know what to take.