Super-absorbent, this slush powder can absorb tap water and immediately solidify. The large Instant Solid Powder Smart Tube test tube comes with powder, three food-coloring tablets and lots of fun experiment and project ideas. “The Instant Solid Powder Smart Tube can absorb 200 to 300 times its weight in water and hold it in a gooey gel.” Dunecraft Inc. Public Relations Specialist Alicia Borley told TDmonthly. “Kids can learn all about osmosis, polymers, saturation and more with this exciting Smart Tube.” Launch date: 2006.