Opaque grey ink jet ink composition, comprising: a solvent comprising one or more organic solvent compound(s); b) a binder, comprising one or more binding resin(s); wherein the ink jet ink composition further comprises: one or more black pigment(s) and/or one or more black dye(s); one or more white pigment(s); wherein the one or more black pigment(s) and/or the one or more black dye(s) is(are) present in a total amount from 0.01% to 9% by weight, of the total weight of the ink jet ink composition; wherein the one or more white pigment(s) is(are) present in a total amount from 0.5% to 30% by weight, of the total weight of the ink jet ink composition; and wherein the ratio:amount by weight of the one or more black pigment(s) and/or the one or more black dye(s)/amount by weight of the one or more white pigment(s) is from 0.001 to 1.

A method for preparing a material for use as a surface of a medical device may include printing, with an ink jet printer and using ink that is curable with ultraviolet light, content onto a surface of material that includes woven ticking fabric laminated with polyurethane. The method may also include curing the ink with the ultraviolet light. The method may also include cutting a section of the material in registration to the content printed on the surface for use in a medical device.

A surface treatment liquid composition for a substrate is provided. The surface treatment liquid composition includes a water-soluble salt, water, and a resin particle including a resin having a structural unit represented by the following formula (1):

##STR00001##

where R.sub.1 represents —COO—; each of R.sub.2 and R.sub.3 independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and n represents an integer of from 5 to 100.

A metallic nanoparticle dispersion includes metallic nanoparticles, a liquid carrier, and a dispersion-stabilizing compound according to Formulae I, II, III or IV,

##STR00001##

wherein Q represents the necessary atoms to form a substituted or unsubstituted a five or six membered heteroaromatic ring; M is selected from the group consisting of a proton, a monovalent cationic group and an acyl group; R1 and R2 are independently selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl or heteroaryl group, a hydroxyl group, a thioether, an ether, an ester, an amide, an amine, a halogen, a ketone and an aldehyde, R1 and R2 may represent the necessary atoms to form a five to seven membered ring; R3 to R5 are independently selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl or heteroaryl group, a hydroxyl group, a thiol, a thioether, a sulfone, a sulfoxide, an ether, an ester, an amide, an amine, a halogen, a ketone, an aldehyde, a nitrile and a nitro group; and R4 and R5 may represent the necessary atoms to form a five to seven membered ring.

A metallic nanoparticle dispersion includes metallic nanoparticles, a liquid carrier, and a dispersion-stabilizing compound according to Formulae I, II, III or IV,

##STR00001##

wherein Q represents the necessary atoms to form a substituted or unsubstituted a five or six membered heteroaromatic ring; M is selected from the group consisting of a proton, a monovalent cationic group and an acyl group; R1 and R2 are independently selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl or heteroaryl group, a hydroxyl group, a thioether, an ether, an ester, an amide, an amine, a halogen, a ketone and an aldehyde, R1 and R2 may represent the necessary atoms to form a five to seven membered ring; R3 to R5 are independently selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl or heteroaryl group, a hydroxyl group, a thiol, a thioether, a sulfone, a sulfoxide, an ether, an ester, an amide, an amine, a halogen, a ketone, an aldehyde, a nitrile and a nitro group; and R4 and R5 may represent the necessary atoms to form a five to seven membered ring.

There is provided rare earth metal complexes of formula (I): ##STR00001##
wherein M is a cation, RE is a rare earth metal; X is a counter anion; and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each independently selected from hydrogen, alkyl of 1-8 carbon atoms, aryl, halo, and alkoxy. Also provided is a composition of europium bis(2,2′-bipyridine-N,N′)-trinitrate with a diketonate dopant. The disclosure also provides processes for preparing the rare earth metal complexes. A mark comprising the rare earth metal complexes, and a method of applying the mark, are disclosed. The rare earth metal complexes may be used in printing systems, and for security applications.

There is provided rare earth metal complexes of formula (I): ##STR00001##
wherein M is a cation, RE is a rare earth metal; X is a counter anion; and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each independently selected from hydrogen, alkyl of 1-8 carbon atoms, aryl, halo, and alkoxy. Also provided is a composition of europium bis(2,2′-bipyridine-N,N′)-trinitrate with a diketonate dopant. The disclosure also provides processes for preparing the rare earth metal complexes. A mark comprising the rare earth metal complexes, and a method of applying the mark, are disclosed. The rare earth metal complexes may be used in printing systems, and for security applications.

Embodiments of the invention relate to edible ink formulations comprising a fluorophore (e.g. riboflavin phosphate), articles of manufacture (e.g. an ink-jet cartridge containing any edible ink formulation(s) disclosed herein), methods for printing on a edible substrates (e.g. food or beverage) using any edible ink formulation(s) disclosed herein. Methods for manufacturing the edible ink formulation are also provided.

Embodiments of the invention relate to edible ink formulations comprising a fluorophore (e.g. riboflavin phosphate), articles of manufacture (e.g. an ink-jet cartridge containing any edible ink formulation(s) disclosed herein), methods for printing on a edible substrates (e.g. food or beverage) using any edible ink formulation(s) disclosed herein. Methods for manufacturing the edible ink formulation are also provided.

An ink is provided. The ink includes a quinacridone pigment and an organic solvent having a solubility parameter of from 9.00 to 11.80 in an amount of from 30% to 60% by mass of total mass of the ink. Both a viscosity change rate and a particle diameter change rate of the ink, before and after the ink is heated at 80° C. for 4 weeks in a sealed state, are in the range of from −5% to 1%.