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Q&A for How to Make Invisible Ink with Baking Soda
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QuestionWhat is the reaction when beetroot is applied over a baking soda solution?Meredith Juncker is a scientific researcher based in Brookline, Massachusetts. Currently working as a Senior Patent Technology Specialist at Dana-Farber Cancer Institute, Meredith is able to leverage her expertise in biochemistry and molecular biology. She received a PhD in Biochemistry and Molecular Biology from Louisiana State University Health Sciences Center, focusing on proteins and neurodegenerative diseases. She went on to work as a Postdoctoral Associate at the Jacobs School of Medicine and Biomedical Sciences at the State University of New York at Buffalo.The beetroot acts as a pH indicator. A pigment in the beetroot called betanin reacts with alkaline/basic sodium bicarbonate, resulting in a deep purple color.
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QuestionWill this work with any light source?Community AnswerIf you use blue filters, yes, as the purpose is to use blue light (higher frequency light waves). This can sometimes be achieved with sufficient thin blue surfaces layered over the light. Using a flashlight would be easiest -- superimpose translucent purple and blue sweet wrappers.
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QuestionCan a purple tinted flashlight be used to read invisible ink?Community AnswerNope. UV lights are usually what has to be used; while a UV light may be purplish, it's a very different kind of light from a flashlight with a purple tint.
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QuestionAre there any other ways you can do this with stuff in your house?Community AnswerIf a baking soda solution will work, a table salt solution will work, too.
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QuestionCan I use a tea bag?Community AnswerNo, it would cause a stain and would not be invisible.
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QuestionCan I use dark food coloring instead of grape or cabbage juice or heat?Community AnswerNo. This method works because of an acid-based chemical reaction that food coloring wouldn't cause.
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QuestionDoes it have to be a fire, or will any heat work when making invisible ink?Community AnswerIt does not have to be fire, it just has to be hot enough to heat the ink. Try using a hair dryer or a iron.
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QuestionCan I mix lemon juice with grape juice to make it more acidic? Will that make it easier to read once it's revealed?Community AnswerNo it won’t make it much easier to read. Lemon juice is what you write with, and the grape juice reveals the baking soda solution, so it won’t work.
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QuestionHow long do I need to wait for the baking soda to dry without ironing?Community AnswerPossibly around 10 minutes. Don’t worry, it will dry quite fast. You shouldn’t dry it with an iron as it will make the letters appear.
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