Each pair needs (be sure to use the same exact materials and amounts of liquid for each pair to ensure constant variables):

• tubs or foil baking pans with water (x2 for each pair when they would like to choose different materials)
• water
• vegetable oil: amount depends on tray; use a 1:4 oil to water ratio
• 2-3 different brands of cotton balls
• 2-3 different brands of sponges
• 2-3 different brands of paper towels
• cotton swabs (such as Q-Tips)
• eyedroppers
• cocoa powder
• spoons
• 500 mL beakers
• ruler
• Oil Spill Clean-Up Worksheet
• chart paper
• blue food coloring (optional)

For the entire class to share:

• poster paper
• markers