> Prior to the early 1900s I remember our salt shakers clumping when I was a kid in the 1990s back in Brazil. We used to put rice grains in it to capture moist

> Prior to the early 1900s I remember our salt shakers clumping when I was a kid in the 1990s back in Brazil. We used to put rice grains in it to capture moisture. If you buy a common 1kg salt bag I bet it still gets wet, no idea why the additives didn’t take hold.