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Perform some of your Halloween magic with the Reappearing Pumpkin Chemical Demonstration Kit. A slight variation of the classic “Blue Bottle Experiment” allows a pumpkin face to disappear and then reappear over and over again.

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Product Details

Perform some of your Halloween magic with this fun demonstration. A slight variation of the classic “Blue Bottle Experiment” allows a pumpkin face to disappear and then reappear over and over again. Shake the flask and the pumpkin face disappears as the dark blue color masks the appearance of the pumpkin face. Undisturbed, the pumpkin magically reappears again!

Concepts: Oxidation–reduction.
Time Required: 10–15 minutes
Chemicals Provided: Sodium hydroxide, glucose, yellow food coloring, and methylene blue.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems

Disciplinary Core Ideas

HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Scale, proportion, and quantity
Cause and effect

Performance Expectations

HS-PS1-1: Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.
HS-PS1-2: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.