For the class demonstration:

• Duct tape
• 1/2 cup chalk dust or fireplace ash
• 3 clear, glass bottles (such as large olive oil or liquor bottles)
• 3 rubber corks with 2 holes drilled in each (the corks must fit snuggly into the bottle openings; available at hardware stores, sometimes predrilled)
• Various pipe connectors, as needed, to transition the narrow tubing to the wider vacuum cleaner nozzle (see Figure 2)
• 5 barb connectors (to connect plastic tubing to corks; the connector must fit snuggly into the holes in the corks; available at hardware stores; see Figure 3)
• 5 ft. clear plastic tubing (the tubing must fit snuggly over the barb connectors; available at hardware stores; see Figure 3)
• Water
• Paper towels
• Wet/dry shop vacuum cleaner