For the Teacher Demonstration:

• 2 beakers of the same size (250 ml or 500 ml)
• 150 ml – 340 ml water (amount depends on beaker size)
• red food coloring (liquid drops, not gel)
• test tube or graduated cylinder (must be narrower than the beakers)
• red laser pointer

Each group needs:

• smart phone with Colorimeter X app installed (available in the Apple App Store)
• 6 test tubes (10 ml)
• test tube holder
• 2 pipettes, serological 10 ml or syringe (10 ml)
• piece of red construction paper
• 10 ml blue Gatorade
• 200 ml distilled water
• marker - any color
• 25-30 popsicle sticks (or craft sticks)
• graph paper or computer with Excel (for graphing)
• 2 beakers (one for water, one for stock solution)
• Much More Than Pretty Colors Worksheet (1 for each student)

Entire class:

• FD&C Blue Dye #1 (to make the stock solution; available online at Amazon, hBARSCI, etc.)
• lab safety equipment (gloves, goggles, etc.)