Search results
Results from the WOW.Com Content Network
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, such as heat or ultraviolet light.
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. They were most popular in the ...
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 ...
[1] [3] According to Wheeler, Johnson had told him lemon juice would make one invisible to security cameras, akin to how it functions as invisible ink. [1] [5] [6] Although initially skeptical, Wheeler had tested this method by covering his face with lemon juice and capturing an image of it with a Polaroid camera. As he was missing from the ...
A pen is a handheld device used to apply ink to a surface, usually paper, for writing or drawing. [1] Additional types of specialized pens are used in specific types of applications and environments such as in artwork, electronics, digital scanning and spaceflight, and computing.
Chinese officials and ordinary people are hopeful but on edge as Donald Trump returns to the White House, eager to avoid a repeat of the bruising trade war that drove a wedge between the economic ...
One 12th century ink recipe called for hawthorn branches to be cut in the spring and left to dry. Then the bark was pounded from the branches and soaked in water for eight days. The water was boiled until it thickened and turned black. Wine was added during boiling. The ink was poured into special bags and hung in the sun.
Make a tasty evening meal with these easy pasta recipes, like creamed spinach pasta or penne with ground turkey, all requiring less than 30 minutes of active time.