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Invisible ink. 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. 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 ...
Written text with UV ink. In the past, the ink used in UV markers has been made from various things such as lemon juice, vinegar, diluted blood, or even urine. [2] The main components in improvised inks have included dilute laundry detergent, body fluids, tonic water, and vitamin B-12 dissolved in vinegar.
Iron gall ink (also known as common ink, standard ink, oak gall ink or iron gall nut ink) is a purple-black or brown-black ink made from iron salts and tannic acids from vegetable sources. It was the standard ink formulation used in Europe for the 1400-year period between the 5th and 19th centuries, remained in widespread use well into the 20th ...
2. Red Wine Vinegar. Red wine vinegar is made by fermenting red wine so that the alcohol turns into acetic acid. This results in a tangy and sour vinegar with a lovely rose-red color. Red wine ...
Jyutping. Saam1 syun1 tou4. The Vinegar Tasters (三酸圖; 'three sours'; 嘗醋翁; 'vinegar-tasting', 'old men'; 嘗醋圖, 尝醋图) is a traditional [clarification needed] subject in Chinese painting, which later spread to other East Asian countries. The allegorical image represents three elderly men tasting vinegar. The identity of the ...
Decoder pen. The decoder pen, yes-no pen, yes-know pen or magic pen book is a combination of decoder pen or marker specially designed to reveal invisible ink -encoded pictures or writing, [1] in the form of answers to questions or hidden parts of pictures, with specially created children's books with hidden words and pictures.
InvisiClues were hint booklets sold by Infocom to help players solve puzzles in their interactive fiction computer games. [1] Before Infocom's games exploded in popularity, players could request hints by mail and receive a type-written sheet in response. When the number of requests proved unmanageable, the Zork Users Group began a pay-per-hint ...
The Out of the Inkwell series ran from 1919 to mid 1927, [2] and was renamed The Inkwell Imps for Paramount, continuing until 1929. [3] In all, 77 Out of the Inkwell and 57 Inkwell Imps films were produced in eleven years. The Inkwell Imps series was replaced by the "Talkartoons" in 1929, and Koko was retired until 1931, appearing as a ...