Projects are done periodically through school or as fun ideas for children to eliminate boredom. Some projects require water or a substance similar to that of the water's image and consistency. Water can become stagnant, build bacteria, promote the growth of germs, and evaporate sooner than other substances. Using clear silicon putty can be a great substitute for actual water. Adding a drop of blue food coloring can make the fake clear silicone water even more like water.