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Lemon Juice Invisible Writing

Here is a fun one to try.  Students are given some lemon juice and some cotton swabs.  They are given some white paper and told to write on it with the juice.

Wait for the lemon juice to completely dry.  This will make it invisible. 

Next, apply heat to the paper.  You can iron it or just hold it up to a warm light bulb.  

 The writing will appear!!!!

What’s happening?
Lemon juice is an organic substance that oxidizes and turns brown when heated. Diluting the lemon juice in water makes it very hard to notice when you apply it the paper, no one will be aware of its presence until it is heated and the secret message is revealed. Other substances which work in the same way include orange juice, honey, milk, onion juice and vinegar.  


This oxidation is a chemical reaction and cannot be reversed easily.  The brown color is actually a new substance.  

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The elephant article was excellent but I also thought the lab on dissecting a flower was broken down so easily, even telling me where to get inexpensive flowers!  This resource helped me teach this challenging standard in an engaging way.  Worth every penny!

 
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Richard S

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Thank you so much for creating this resource! It is such a fun and engaging activity for my students, especially during distance learning.   Honey Bee Digital Escape Distance Learning
My students loved this unit. I was able to present different elements of it throughout the month. It is hard to find interesting non-fictional, age-appropriate text for my students that they will enjoy. This was a great unit that aligned well for my students who have very different goals within the same group.

 
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Teaching Science with Lynda R. Williams
2020-11-03T20:45:49-07:00

Heidi J

My students loved this unit. I was able to present different elements of it throughout the month. It is hard to find interesting non-fictional, age-appropriate text for my students that they will enjoy. This was a great unit that aligned well for my students who have very different goals within the same group.   Compare and Contrast Two Texts on Reindeer
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Tina S

Teaching Science with Lynda R. Williams
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2016-05-03T18:05:39-06:00

Tina S

I am so impressed with this unit which manages to be distance learning and hands-on at the same time.  Really well thought out and engaging activities that allow students to practice each of the eight Science and Engineering Practices.  Really no prep for me!   Science and Engineering Practices Distance Education Unit
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Teaching Science with Lynda R. Williams