what exactly does magnetic ink have in it vs. regular ink?

Answer 1

http://www.freepatentsonline.com/6248805.html
Abstract: Specific core-shell binders and magnetic additives for use in ink-jet printing ink compositions are provided. One class of specific core/shell binders has the general formula [A.sub.m B.sub.n C'.sub.p ].sub.x, where A and B are hydrophobic components in which A exhibits a glass transition temperature T.sub.g between about -150.degree. and +25.degree. C. and B exhibits a glass transition temperature greater than 25.degree. C., C' is a component that forms hydrophilic or water-soluble component in the polymer chain, and has an ionic or non-ionic structure, m<30 wt %, n>40 wt %, and p<30 wt %, with the total of m+n+p=100 wt %, and x=1 to 100,000. The molecular weight (weight average) of the polymer is between about 1,000 and 2,000,000. The polymers useful in the practice of the invention are prepared by emulsifying the monomers and then conducting a free-radical polymerization in water. The foregoing binder polymer is used in conjunction with magnetic additives comprising either (a) inorganic magnetic compound containing at least one of iron, cobalt, and nickel or (b) organic magnetic complexes containing at least one of iron, cobalt, and nickel or (c) organic charge transfer complexes that exhibit magnetic properties. The ratio of binder (I) to colorant (pigment) is greater that 1 to 10. The concentration of the magnetice additive is within the range of 1 to 30 wt %. The general ink formulation comprises: 5 to 50 wt % water-miscible solvent; 0.5 to 10 wt % colorant; 1 to 30 wt % magnetice additive; and water.
VR

Answer 2

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Answer 3

They have iron or other metals magnetic salts in it, and can be read by magnetic readers machines, like your credit cards or the numbers in your checks, etc.

Answer 4

intelligence
watch out for sentient ink products

Answer 5

metal