Abstract: An ink composition for writing on an absorbent or pervious writing surface to form thereon a writing or marking composed of an inner portion of a metallic color with outer contour portions therearound of a dyestuff-based color, which composition comprises:a nonleafing metal powder pigment as a first pigment,an inorganic or organic pigment as a second pigment,a dyestuff, anda solvent,the nonleafing metal powder pigment being dispersed in the solvent and having a particle size sufficiently large so as to substantially not permeate or be absorbed into the writing surface, andthe second pigment being dispersed in the solvent and either having a particle size sufficiently large so as to substantially not permeate or be absorbed into the writing surface, or having a particle size sufficiently large so as to substantially be adsorbed on the nonleafing metal powder pigment,the dyestuff being dissolved in the solvent, being capable of substantially permeating or being absorbed into the writing surface and diffusing in

Abstract: An ink composition for writing or marking on an absorbent or pervious writing surface to provide a writing or marking composed of an inner portion of a first color with outer contour portions therearound of a second color, which composition comprises:a first colorant,a second colorant anda vehicle,said first colorant being dispersed in said vehicle and having a particle size sufficiently large so as to substantially not permeate or be absorbed into said writing surface andsaid second colorant being dispersed or dissolved in said vehicle, being capable of substantially permeating or being absorbed into said writing surface and diffusing into the area on said surface proximate to said writing,whereby said second colorant forms said outer contour portions around said inner portion of said first colorant.

Abstract: An implement for writing on an absorbent or porous surface as provided, said implement including a writing or marking tip and said implement containing a writing medium, wherein said writing medium comprises an ink composition including:a first colorant,a second colorant anda vehicle,said first colorant being dispersed throughout said vehicle and having a particle size sufficiently large so as to substantially not permeate or be absorbed into said writing surface andsaid second colorant being dispersed or dissolved throughout said vehicle and being capable of substantially permeating or being absorbed into said writing surface and diffusing into the area on said surface proximate to said writing,whereby writing applied by said implement to said surface includes an inner portion of said first colorant bordered by substantial outer portions formed by said second colorant.

Abstract: An ink composition for writing on an absorbent or pervious writing surface to form thereon a writing or marking composed of an inner portion of a first color with outer contour portions therearound of a second color, which composition comprises:a polar organic solvent,a nonpolar organic solvent which is miscible with the polar organic solvent,a first dyestuff which is soluble both in the polar organic solvent and a mixture of the polar organic solvent and the nonpolar organic solvent, but which is insoluble in the nonpolar organic solvent, anda second dyestuff which is soluble both in the nonpolar organic solvent and a mixture of the polar organic solvent and the nonpolar organic solvent, the second dyestuff being different in color from the first dye-stuff,whereby the first dyestuff forms in conjunction with the second dyestuff the inner portion of the first color based on the first and the second dyestuffs, and the second dyestuff forms the outer contour portions of the second color based on the second dyes

Abstract: A method for writing or marking on an absorbent or pervious writing surface to provide a writing or marking composed of an inner portion of a first color with outer contour portions therearound of a second color, which method comprises applying to said surface a writing or marking with an ink comprising:a first colorant,a second colorant anda vehicle,said first colorant being dispersed in said vehicle and having a particle size sufficiently large so as to substantially not permeate or be absorbed into said writing surface andsaid second colorant being dispersed or dissolved in said vehicle, being capable of substantially permeating or being absorbed into said writing surface and diffusing into the area on said surface proximate to said writing,whereby said second colorant forms said outer contour portions around said inner portion of said first colorant.

Abstract: An erasable ink composition for writing or marking on an impervious surface which comprises: about 40-90% by weight of an organic solvent; about 1-10% by weight of a pigment; about 1-25% by weight of a separating agent which is soluble in the solvent, and is a non-volatile or only slightly volatile liquid at normal temperatures having a lower vapor pressure than the solvent; about 0.5-20% by weight of a synthetic resin which is soluble both in the solvent and a solution of the separating agent in the solvent, and is insoluble or only slightly soluble in the separating agent; and about 0.05-20% by weight of a hydrocarbon wax.