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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.
If a bundle containing a dye pack is removed from a specified area (i.e. taken out of bank doors), it explodes, releasing an indelible ink dye and possible array of additional chemicals. The conspicuous bright color (usually red) stains on the bills, allow quick easy visual recognition of stolen money.
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 ...
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.
Toner cartridges cannot be refilled indefinitely, because mechanical parts such as rollers wear out. Some cartridges include the electro-optical drum, which becomes depleted and can be scratched. Organizations refilling cartridges for resale usually clean and test each cartridge to ensure that it is fit for reuse and resale.
Ink cartridges are typically priced at $13 to $75/US fl oz ($1,664 to $9,600/US gal; $440 to $2,536/L) of ink, [15] meaning that refill cartridges sometimes cost a substantial fraction of the cost of the printer. To save money, many people use compatible ink cartridges from a vendor other than the printer manufacturer [citation needed].
The cost of the refills adds up — you'll pay more than $8 for 20 brushes. And as experts caution , the flimsy wands often snap, and the brushes aren't great for scrubbing.
Aburidashi is a ninja technique of sending secret messages using a form of invisible ink. [1] The technique uses ink made of juice extracted from soaked and crushed soybeans . [ 1 ] The message becomes visible to the recipient by heating the paper.
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