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Mod a cartridge to print invisible ink

We've all tried writing with lemon juice (a.k.a. invisible ink). It's a mess. And the main draw back is definitely efficiency.

Spy work requires extensive (and sometimes wordy) communication.

Enter: the printer mod. We were super impressed when our friend Loup sent us this video on printing with invisible ink!

The ultraviolet ink is the most sophisticated of the invisible breed.

Some alternatives we found were urine, vinegar, wine, honey, lemon juice, milk and onion juice.

For the very adventurous...consider British Secret Intelligence Service chief, Sir George Mansfield Smith-Cumming's favorite covert ink: semen. As an endorsement of its official use, he proclaimed to his spies, "Every man carries his own stylo".

WonderHowTo is not responsible for semen damage to your Epson.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.

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