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Fetch! Operation Espionage

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Participants create invisible ink and reveal message with different liquids.

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Rating 
Participants Enjoyed the Activity 
Participants Learned from This Activity 
Activity Instructions Were Clear and Easy to Follow 
Would Recommend 
04/24/2018

Great WOW factor

Kids had a ton of fun mixing up the baking soda ink, writing with it, then drying and revealing it. The mess was significantly less than I expected, given the supplies. Tearing the cotton balls in half seemed to discourage over-saturating them, and it requires a pretty minimal amount of the juice to cause the writing to appear. Next time I'll put bowls at each table to collect used cotton balls to ease clean-up still more.

Only the grape juice concentrate made a vivid line. The more dilute version did show up, but cranberry juice had minimal effect. We added an additional trial with lemon juice, which didn't seem to react at all. The additional trials cause me to be a little skeptical of the simple acid/base explanation and suspect that the grape juice contains another compound involved in the process.

In any case, it definitely held attention and got participants excited and eager to consider further trials and more ways to explore the concepts.

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Fetch! Operation Espionage

Fetch! Operation Espionage

Participants create invisible ink and reveal message with different liquids.