Salt is it's own gigantic rabbit hole! "Sea Salt", as Koraks mentioned, varies enormously depending on how and where it was made ... and can contain small amounts of lots of other things ( sulfates, magnesium, carbonates, potassium, bromides, and these days microplastics too I guess ) Anti-caking agents like silicates or sodium ferrocyanide are sometimes added. There is a fun book called "Salt" by Mark Kurlanski about the history of salt. Every salt I've tried ( dozens! ) behaves slightly differently and sometimes big color differences.