Q&A for How to Make an Invisible Ink Pen

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Is there something I can use instead of the grape juice?

Community Answer

Yes. Lemon juice or vinegar should also work.

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Question

Where can I get petroleum jelly?

Lexi Gen13

Community Answer

You can get petroleum jelly at any drug store such as CVS, Walgreens, or Target. Petroleum jelly is also called Vaseline.

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Question

What can I use instead of acid and how do I fill that ink in the pen?

floortjj1

Community Answer

Lemon juice or vinegar should work. For the pen, maybe you could take an empty pen and try adding the ink with a syringe.

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Question

Instead of lemon, can I use lime?

Community Answer

Yes, the lemon juice and the lime juice are both acidic, so it should work.

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Question

What is the principle behind this process?

floortjj1

Community Answer

Baking powder is an indicator, which means it reacts with acidic or basic substances. Indicators react with certain pH values.

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Question

How do I fill the pen with invisible ink without a syringe?

Community Answer

You could try to make a tiny funnel, but a syringe is more efficient, and they are relatively cheap.

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Question

Will the grape juice dry up so the message can fade away?

Community Answer

The grape juice will not fade away.

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Question

Would Vaseline work instead of petroleum jelly, and does it have to be computer paper?

Community Answer

Yes, Vaseline is just a brand name for petroleum jelly. The type of paper does not matter as long as you can write on it. (For example, if it is too glossy, the ink might not stick to the paper well.)

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Question

Can I store the ink in the body of a sealed pen?

Community Answer

Yes, but make sure to clean it out with water so it does not mess up the solution.

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Question

Is it okay to use baking powder instead of baking soda?

Community Answer

Baking soda requires an acid to activate. Baking powder already has an acid in it, therefore will not create the reaction you are looking for.

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Question

Will lemon juice completely fade away when it is dry?

Community Answer

Yes, it will because it's acidic. The lemon juice will fade away because of the dryness of the paper and because of its acidity.

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Question

Will invisible ink show up eventually? I drew around my house, and I don’t want my parents to find it.

SSU LL

Community Answer

No, it won't. Invisible ink is designed to remain invisible until a specific method or substance is applied to reveal it.

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