Invisible ink is a substance that is used to write messages that are not visible under normal conditions but can be revealed through various methods. This technique has been historically used for secret communications, espionage, and novelty purposes. Invisible ink can come in various forms, including: 1. **Chemical Solutions**: Some invisible inks are made from chemical compounds that are colorless or nearly colorless when applied. When exposed to heat, ultraviolet light, or specific chemicals, these inks reveal their messages.
Articles by others on the same topic
There are currently no matching articles.