The color...
It has some different minerals (in trace amounts) in it other than sodium, which gives it a different color and taste. But it’s still almost all sodium chloride, so it’s not much healthier.
But if you want to know how salt isn’t just salt, watch the second episode of “Salt, Fat, Acid Heat.” It’s amazing. The whole show is actually amazing. Samin Nosrat is delightful in it.
It's impurities in the salt, in other words.
