Invisible Ink Pen APK
APK Version History
- Version
- 1.1.1 (1)
- Architecture
- universal
- Release Date
- October 23, 2022
- Requirement
- Android 4.1+
Download [ 8.4 MB ]
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About Radio FM 90s
Invisible ink pen contains a special type of ink made from naturally fluorescent chemicals or organic compounds. When you shine a UV light down on a message or drawing made with invisible ink, the electrons within the ink’s fluorescent molecules are excited, briefly shifting to a higher-energy orbit around their nuclei. When those electrons shift back to their normal orbit, the absorbed energy is expelled in the form of visible light.