Patent ID: 8915583

Claim:
A method for providing disappearing inks, said method comprising: selecting a first ink comprising a first formulation of ingredients prepared to cause the first ink, upon deposition onto an ink receiving media, to disappear therefrom at a first rate; and selecting a second ink comprising a second formulation of ingredients prepared to cause the second ink, upon deposition onto the ink receiving media, to disappear therefrom at a second rate which is different than the first rate; wherein disappearance from the media by the first ink is achieved via at least one of evaporation or sublimation and disappearance from the media by the second ink is achieved via at least one of evaporation or sublimation; wherein the first formulation of ingredients comprises (i) glycerin and (ii) one or more lower boiling point liquids selected from the group consisting of water, methanol, and ethanol; wherein the second formulation of ingredients comprises (iii) glycerin and (iv) one or more lower boiling point liquids selected from the group consisting of water, methanol, and ethanol; and wherein a first weight ratio of component (i) to component (ii) in the first formulation of ingredients is different from a second weight ratio of component (iii) to component (iv) in the second formulation of ingredients.