Explain how magnetic ink is useful?
819396
The biggest use of which I'm aware for magnetic ink is the printing at the bottom of a check.  This generally includes the bank's routing number, the account number, and the amount for which the check is written (used to be put on by data entry operators when I worked at the Federal Reserve Bank back in the 70s - may be automated now...).  The coding on the checks enables them to be processed by computerized sorting machines, rather than having to be done by hand - not a viable proposition when a bank handles a couple million checks in a day.
1054406
And just how do you propose I put a diagram on Y!A?\n\nNonetheless, electricity can be used to generate electricity, as mentioned.  Put three magnets around a rotating shaft & you get 3Φ electricity.\n\nMagnets work in compasses to help a person find direction.\n\nMagnets can be used to hold cabinet doors closed.\n\nMagnets can be used to lift things (like in a junkyard to move vehicles to a compactor), or to remotely move magnetic items (like if you can't reach your car keys, you could retrieve them with a strong enough magnet).
3986
From what I have read about it and the referenced websites:\n\nFor nearly 2,000 years, ink on paper was the only way to display words and images, and it still beats computer displays when it comes to portability and price. Paper also doesn't require an external power supply. Yet it does have some limitations: Once you've printed words on paper, those words cannot be changed without at least leaving some marks, and it is also difficult to carry around a large number of books.\n\nTwo companies are simultaneously developing similar electronic inks -- E Ink of Cambridge, MA, and Xerox in Palo Alto, CA. At first glance, a bottle of electronic ink looks just like regular ink, but a closer examination shows something much different. Although the two companies' products vary slightly, here are the three components of both electronic inks that give them the ability to rearrange upon command:\n\n    * Millions of tiny microcapsules or cavities\n    * An ink or oily substance filling the microcapsules or cavities\n    * Pigmented chips or balls with a negative charge floating inside the microcapsule \n\nElectronic ink can be applied to the same materials that regular ink can be printed on. In the case of a digital book, the pages would be made out of some kind of ultra-thin plastic. The ink would cover the entire page, separated by cells that resemble the cells on graph paper. Think of these cells as pixels on your computer screen, with each cell wired to microelectronics embedded in this plastic sheet. These microelectronics would then be used to apply a positive or negative charge to the microcapsules to create the desired text or images.
475328
How wet you need ? Since many printer factory trying to save ink usage as much as possible, it's a better idea to use old model. Another ways is use different paper that doesn't absorb ink too much, and maybe you can set the ink slider on your printer properties, if any, to spend more inks.
937836
I don't know much about that therapy, but I could give you some logic to think of.  Blood has iron in it. Iron is attracted to magnets.\nGood circulation heals, and possibly relieves pain (?).\nSo if you want pain relieved in a certain place, it would be logical to want blood there, so maybe the magnet attracts the iron in the blood, and causes the blood to flow there, or flow more freely or in a different way. Other than that I have no clue why magnets would help you, other than possibly cancelling out neurons that send electrical pulses.
1079795
Don't know the specifics of the "spy kit", so I can only guess that the invisible ink you're using is water-soluble.  If so, and the paper has gotten wet, then the ink has bled (wicked) out over the paper, and there is no way to return it to its original state.\n\nOh, sorry about that, Chief. (Do you remember "Get Smart"?)
214853
Often they use pad printing... they find a mold to hold each product in exactly the same spot... then a thing comes over... presses down and puts the ink on... but there are other methods as well...
1164971
Most multifunction devices use ink-jet printers for the printing components.  If the ink you buy is in a cartridge that slides into a carriage that is attached to a bar, and this unit slides back and forth over the paper, you've got an inkjet printer.\n\nYours, for sure, is an inkjet printer.  I ascertained this info by going to lexmark.com then clicking on "technical support" then clicking on the model, and found enough references to ink-jet that I am sure the Lexmark x125 uses an ink-jet to print and should take "ink-jet" papers of most types including iron on.
362458
If the printer is using liquid ink, you can open it up, take out the ink cartridge, and shake it to listen and guesstimate how much you have left. If you start to see streaks and lines in your printed material, thats when you're running out.
593989
It helps to buy inket paper. Compared to plain xerox paper, it is a bit shinier and whiter and crisper. It is not too expensive, you can find it at office supply stores.\nIf you do use plain paper, make sure your printer is set at that paper type, or it will soak through it too much.
651090
There are a number of methods: the traditional powder method, magnetic powder, ninhydrin, fuming with super glue...  The best/easiest method is highly dependent on what kind of surface you're attempting to lift the print from.  You'd use one of the powders for glass, but it would be useless on paper; vice versa for ninhydrin.
4924
Tom's Hardware has a nice review of inkjet multi-function printers.  I've found the reviews on that site to be based on facts and pretty reliable.\n\nI hope it helps!
537198
See the listing of suppliers given in the source below.  If you want to do magnetic separation, you'll want multi-domain particles, which means using particles *larger* than about 100 nm (depending on the material).
489874
A smaller ink cartidge, basically just a starter.  How long it will last will vary by how you use it (type of printing, quality level, etc...) but it will not last very long.
94910
Daisy wheel - "wheel" with characters arranged around the outer edge of the wheel.  rotates the printing character to the "top" of the wheel then uses a head to strike it  against an ink ribbon then on to a piece of paper.\n\nThimble printer - semi-spherical metallic head with characters protruding from various positions.  Head is placed on an arm that rotates to a character's position and strikes against an ink ribbon/paper.\n\nLaser printer - laser heats up "dots" on piece of paper to form characters/grahpics.  Toner is sprayed onto page, then fused with paper as it is rolled through hot fuser roller.\n\nInkjet printer - printer head emits tiny drops of ink onto page to form characters.  the ink is absorbed by the paper.\n\nNot sure about electrostatic.
636567
A simple magnetorheological fluid can be home-made out of small magnetic particles mixed with mineral or vegetable oil. Iron filings do not work well; they are too big. Good sources for small magnetic particles are:\n\n    * magnetic inspection powder from welding shops\n    * particles from burned steel wool (after mortar and pestle)\n    * particles scraped from the surface of video tapes\n    * particles "mined" from sand with a plastic bag and a magnet (see external links)\n\nThese fluids are not very stable, however. The particles will tend to clump and the fluid properties will be lost quickly. Fluids created for professional purposes use emulsifiers to suspend very small oily (octane or kerosene) magnetic particles in water. The particles are very fine; less than a micrometre in diameter.
109551
Inside a copier there is a special drum. The drum acts a lot like a balloon -- you can charge it with a form of static electricity. \n\nInside the copier there is also a very fine black powder known as toner. The drum, charged with static electricity, can attract the toner particles. \nThere are three things about the drum and the toner that let a copier perform its magic: \nThe drum can be selectively charged, so that only parts of it attract toner. In a copier, you make an "image" -- in static electricity -- on the surface of the drum. Where the original sheet of paper is black, you create static electricity on the drum. Where it is white you do not. What you want is for the white areas of the original sheet of paper to NOT attract toner. The way this selectivity is accomplished in a copier is with light -- this is why it's called a photocopier! \n\nSomehow the toner has to get onto the drum and then onto a sheet of paper. The drum selectively attracts toner. Then the sheet of paper gets charged with static electricity and it pulls the toner off the drum. \n\nThe toner is heat sensitive, so the loose toner particles are attached (fused) to the paper with heat as soon as they come off the drum. \nThe drum, or belt, is made out of photoconductive material. Here are the actual steps involved in making a photocopy: \nThe surface of the drum is charged. \n\nAn intense beam of light moves across the paper that you have placed on the copier's glass surface. Light is reflected from white areas of the paper and strikes the drum below. \n\nWherever a photon of light hits, electrons are emitted from the photoconductive atoms in the drum and neutralize the positive charges above. Dark areas on the original (such as pictures or text) do not reflect light onto the drum, leaving regions of positive charges on the drum's surface. \n\nNegatively charged, dry, black pigment called toner is then spread over the surface of the drum, and the pigment particles adhere to the positive charges that remain. \n\nA positively charged sheet of paper then passes over the surface of the drum, attracting the beads of toner away from it. \n\nThe paper is then heated and pressed to fuse the image formed by the toner to the paper's surface.