I got a couple of e-mails and messages on Facebook after yesterday's S week post asking about coloring salt so I thought I would share a quick tutorial!
We used very coarse salt. Table salt would work just fine, but I think it always looks cooler with the coarser, larger grains of salt. To get the most vibrant color (and to make it safe for tasting, though they typically learn really quickly that salt doesn't taste very good), we use glitter sprinkles.
Add a few shakes of sprinkles to your bag of salt.
Massage the sprinkles and salt around until the color is all mixed together. The water will melt the sprinkles and color the salt beautifully!