Stir together the food coloring and contact solution.
In a mixing bowl, add the glue.
Stir in the baking soda.
Then, stir in the colored contact solution.
Once the slime is mostly mixed together, knead with your hands to really mix well.
Notes
Make sure to use a contact solution that contains boric acid, like ReNu.If want to omit food coloring but still have colored slime, use a colored or glittery glue. It's best to use mixing bowls and utensils that are not for food use.