No, we have not gone crazy, although it has this color between pink and gray, it is black salt from India , better known as Kala Namak or Kala Loon. The reason for the name is because of its volcanic origin, and due to this origin its chemical composition.
It is a condiment with a somewhat peculiar, sulfurous smell, with a lower salting power than common salt but widely used in the cuisine of India , Pakistan and Bangladesh due to its properties against heartburn or flatulence. Also, for those people who cannot consume sodium due to blood pressure, the use of this type of black salt is recommended.
Very appreciated by vegans , since due to the smell that we have mentioned, it is used to dress salads and replace the flavor of the egg with that of black salt since it is quite similar. And it gives the tofu a very good taste if we spread it above. Chutneys, homemade pickles, raita and especially chat masala, spice mix for legumes are other uses.