Can you make invisible ink with ingredients from your pantry? Learn the science behind invisible inks. Gather paper, cups, q-tips, baking soda, water, grape juice, tomato juice, lemon juice, milk and yogurt for this challenge with YELL 2020 teen intern Joyce L.

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STEM Challenge Yo’Self | Teen Takeover is created by the San Francisco Public Library from the Youth Engaged in Library Leadership (YELL) STEM team. Stay STEM-tastic by reading, learning and experimenting at home. Gather materials for a new challenge posted at 3pm on weekdays throughout October. Visit www.sfpl.org/stemchallenge for more resources.