![](/sites/default/files/styles/2_1_small/public/2020-09/313.jpg?h=b530fb14&itok=115by2j4)
3:00 - 3:15
Estados Unidos
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.
Tune in to SFPL YouTube.
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.