Process for providing PCC useful for ink-jet printing applications, of the type according to which a calcium hydroxide slurry is first prepared by mixing quicklime (CaO) with water in a stirring reactor or tank ("slake"), the calcium hydroxide slurry is then screened, such as on a 100 μm screen, to remove any residual impurities and/or non-reactive unburnt lime, the screened slurry is then directed towards a stainless steel reactor equipped with an agitator; the temperature is adjusted, generally to between 10 and 70°C, and subsequently the slurry is directed towards a carbonation reactor or tank, wherein carbon dioxide-containing gas is bubbled through the slurry, the slurry exits the carbonation tank when appropriate in view of conductivity and pH, generally when the conductivity reaches a minimum and the pH drops below 8, the particles passing a 45 μm screen are recovered, such that the slurry contains only the ultrafine PCC agglomerates of the invention, - characterized by the implementation of process steps comprising the following: A First steps, production of the PCC: A1 - the carbonation step is performed at a carbonation gas flow rate of below 30 litres per minute at standard temperature and pressure per kilogram calcium hydroxide during precipitation, and - the particles passing a 45 μm screen are recovered, such that the slurrycontains only the ultrafine PCC agglomerates and A2 - the said screened calcium hydroxide slurry is treated by a combination of magnesium sulphate and aluminium sulphate and/or by a combination of magnesium sulphate and zinc sulphate - optionally in the presence of an acid, preferably sulphuric acid - until stable, porous agglomerates/aggregates are obtained at a concentration of 5 to 25% solids, preferably 15 to 20% solids ("precursor"). - characterized by the implementation of process steps comprising the following: A First steps, production of the PCC: A1 - the carbonation step is performed at a carbonation gas flow rate of below 30 litres per minute at standard temperature and pressure per kilogram calcium hydroxide during precipitation, and - the particles passing a 45 μm screen are recovered, such that the slurrycontains only the ultrafine PCC agglomerates and A2 - the said screened calcium hydroxide slurry is treated by a combination of magnesium sulphate and aluminium sulphate and/or by a combination of magnesium sulphate and zinc sulphate - optionally in the presence of an acid, preferably sulphuric acid - until stable, porous agglomerates/aggregates are obtained at a concentration of 5 to 25% solids, preferably 15 to 20% solids ("precursor"). A First steps, production of the PCC: A1 - the carbonation step is performed at a carbonation gas flow rate of below 30 litres per minute at standard temperature and pressure per kilogram calcium hydroxide during precipitation, and - the particles passing a 45 μm screen are recovered, such that the slurrycontains only the ultrafine PCC agglomerates and A2 - the said screened calcium hydroxide slurry is treated by a combination of magnesium sulphate and aluminium sulphate and/or by a combination of magnesium sulphate and zinc sulphate - optionally in the presence of an acid, preferably sulphuric acid - until stable, porous agglomerates/aggregates are obtained at a concentration of 5 to 25% solids, preferably 15 to 20% solids ("precursor"). A1 - the carbonation step is performed at a carbonation gas flow rate of below 30 litres per minute at standard temperature and pressure per kilogram calcium hydroxide during precipitation, and - the particles passing a 45 μm screen are recovered, such that the slurrycontains only the ultrafine PCC agglomerates and - the carbonation step is performed at a carbonation gas flow rate of below 30 litres per minute at standard temperature and pressure per kilogram calcium hydroxide during precipitation, and - the particles passing a 45 μm screen are recovered, such that the slurrycontains only the ultrafine PCC agglomerates A2 - the said screened calcium hydroxide slurry is treated by a combination of magnesium sulphate and aluminium sulphate and/or by a combination of magnesium sulphate and zinc sulphate - optionally in the presence of an acid, preferably sulphuric acid - until stable, porous agglomerates/aggregates are obtained at a concentration of 5 to 25% solids, preferably 15 to 20% solids ("precursor"). - the said screened calcium hydroxide slurry is treated by a combination of magnesium sulphate and aluminium sulphate and/or by a combination of magnesium sulphate and zinc sulphate - optionally in the presence of an acid, preferably sulphuric acid - until stable, porous agglomerates/aggregates are obtained at a concentration of 5 to 25% solids, preferably 15 to 20% solids ("precursor").