page_title: Invisible ink
hierarchical_section_title: Invisible ink
caption_attribution_description: English: This is a reproduction of one of Benedict Arnold's coded communications with the British while he was negotiating what eventually became a failed attempt to surrender the fort at West Point in 1780. Lines of text written by his wife, Peggy Shippen Arnold, are interspersed with coded text (originally written in invisible ink) written by Arnold.
context_page_description: Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means. Invisible ink is one form of steganography.
context_section_description: Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means. Invisible ink is one form of steganography.
caption: A coded letter from Benedict Arnold, originally written in invisible ink. Handwriting by Peggy Shippen Arnold is interspersed with coded communication in Arnold's hand.
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