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www.scientificamerican.com/article/bring-science-home...

Invisible Ink and More: The Science of Spying in the Revolutionary War. April 20, 2010 — Steve Mirsky

www.kidzworld.com/article/3844-making-invisible-ink-appear

Invisible ink isnt something you just see in James Bond movies or in the X-Files. In fact even prisoners used to sneak messages out with invisible ink. Read on to find out how it works.

www.sciencekids.co.nz/experiments/invisibleink.html

Enjoy our range of fun science experiments for kids that feature awesome hands-on projects and activities that help bring the exciting world of science to life. Invisible Ink with Lemon Juice. Making invisible ink is a lot of fun, you can pretend you are a secret agent as you keep all your secret codes and messages hidden from others.

www.thoughtco.com/make-invisible-ink-with-baking-soda-602224

Follow these easy instructions to make non-toxic invisible ink, in just a few minutes, using baking soda (sodium bicarbonate). The advantages of using baking soda are that it's safe (even for kids), simple to use, and readily available.

www.sciencefairadventure.com/projectdetail.aspx?projectid=158

Their high citric acid level, which is about 5% of it's dry weight, gives lemons a tart taste and also makes them prime candidates for use in various educational science experiments. Beyond it's use in fun and exciting science projects, citric acid has many other applied uses including biotechnology and cleaning solutions.

sciencefair.math.iit.edu/projects/invisibleink

Invisible Ink is a substance used for writing, which is either invisible on application, or sooner thereafter, and which later on can be made visible by some means. Once the writing is dried, the paper, or writing surface should appear blank and of similar texture as surrounding material. There are few types of invisible inks.

www.rsc.org/learn-chemistry/resource/res00001948/invisible-inks

In this experiment, students test a variety of substances to see if they can be used as an invisible ink. Writing messages with a variety of substances which can be used as invisible inks. Changing the conditions of the invisible inks to see if messages become visible. Using my scientific knowledge ...

explorable.com/invisible-ink-experiment

Invisible ink is fascinating, not just for kids but for everyone who is young at heart! You can actually get them from kiddie stores and other fun prank stores. But few people know that we can make invisible ink just by using materials that can be found in our very own kitchen!..

www.education.com/science-fair/article/invisible-ink-oxidation

The goal of this science fair project is to demonstrate the effects of oxidation by writing a message in invisible ink made from lemon juice.

www.stevespanglerscience.com/lab/experiments/secret-lemon...

Secret Message with Lemon Juice – SICK Science Lemon juice is great in lemonade, can be a garnish for foods, and doubles as an ink for your secret messages. Ah, a tall, cool glass of lemonade on a hot day just makes everything better.