Each group needs:

• 25 ml test tube with a stopper or threaded lid
• 1, 0.5-inch diameter x 0.250-inch thick rare earth neodymium disc magnet (such as part number NSN0641, quantity 8 for $13 at: https://www.magcraft.com/disc-magnets)
• glass stir rod, or Popsicle^® stick
• duct or electrical tape (if using a stopper)
• 1 empty fountain pen/ink applicator
• blank sheet of paper
• apron and goggles (for each student)
• (optional) latex gloves (for each student; toner may stain skin and clothes)
• lab glass wear, such as a 200 ml beaker
• Magnetic Fluids Worksheet, one per student

To share with the entire class:

• 250 ml beaker
• 1 bottle MICR toner powder refill (such as HP C4127 #27, 500 g bottle, $36 at: https://www.inkowl.com/laser/micr-refill-kits/hp/1-micr-toner-refill-for-use-in-hp-c4127-27-c4129-29-c8061-61/P3305/) NOTE: Refill bottle lasts for multiple liquid magnet activities.
• 1 bottle vegetable oil (available at grocery stores)
• graduated cylinders, for measuring oil and toner