Pour salt into sandwich bag, add food coloring. (If using gel, cover with more salt. This helps stop it from sticking to the bag as much.)

Make sure the bag is closed well (whoops!) and pinch and shake until the salt is evenly colored. (Gel coloring will stick to the bag a little. Pinch some salt inside the bag and rub it around on the gel to help release it.)

Once your salts are colored, use the spoon and funnel to layer different colors in the jar. You can create different patterns by holding the jar on an angle while you add the salt. Add slightly more salt than you think you need. The cork will press it down.

Hot glue the cork into the opening.