Abstract: The present disclosure relates to writing instruments which are charged with a water-based ink composition comprising trimethylolpropane. The present disclosure also relates to a solid ink composition which may be used to refill the rechargeable writing instrument. The solid ink composition itself is a concentrate of the water-based ink composition and can be diluted by the user with e.g. water to produce the aforementioned water-based ink composition. The present disclosure further relates to methods of producing the solid ink composition and the water-based ink composition as well as to various uses thereof.

Abstract: The present disclosure concerns a water-based color-changing ink composition with two different states of color over time, an initial color A and then a second color B which is not colorless, comprising a volatile pH-modifier base capable of evaporating at room temperature (20° C.), a pH-sensitive dye, and an optional non-pH sensitive dye. The disclosure also concerns a method for preparing such color-changing ink composition. A writing instrument comprising such color-changing ink composition, and a kit comprising such color-changing ink composition and an eradicator, as well as methods for writing on a substrate, are also part of the disclosure. Finally, the disclosure aims at a substrate coated with a color-changing ink composition according to the disclosure.

Abstract: The present disclosure relates to writing instruments which are charged or recharged with a water-based ink composition. The water-based ink composition may be prepared from solid ink compositions which may be diluted with water. The solid ink composition comprises a specific combination of polyethylene glycol, at least one coloring agent and a humectant.