A process for making composite precipitated calcium carbonate particles, the process comprising: providing ash particles, on a dry basis, comprising at least 25 wt% CaO, and the sum of the ash particle components comprising the elements Titanium (Ti), Aluminum (Al), and Silicon (Si) is 25 - 35 wt% of the ash particles, on a dry basis; wherein the wt% of CaO and the sum of the components comprising the elements aluminum, silicon and titanium, expressed as a wt%,_are determined by X-ray diffraction; and wherein the ash particles are the product of incineration of a material comprising a wastepaper deink residue; forming an aqueous slurry of the ash particles, wherein the water used to form the slurry, prior to addition of any optional additives, comprises not more than 500 mg/liter elemental calcium; and wherein other optional materials that are not sources of calcium are not more than 5 wt% of the slurry when all materials have been added to the slurry; and carbonating the aqueous slurry to form composite precipitated calcium carbonate particles; wherein no wet milling is performed; and wherein either the only sources of calcium are from the ash particles and the water used in forming the slurry of the ash particles; and no source of calcium is added to the material to be incinerated or to the incinerator; or a source of calcium is added to the material to be incinerated, to the incinerator, to both the incinerator and material to be incinerated, at another point in the process, or a combination thereof, such that the ratio of the weight of calcium added, expressed as elemental calcium, to the weight of ash, is not more than 1.0. providing ash particles, on a dry basis, comprising at least 25 wt% CaO, and the sum of the ash particle components comprising the elements Titanium (Ti), Aluminum (Al), and Silicon (Si) is 25 - 35 wt% of the ash particles, on a dry basis; wherein the wt% of CaO and the sum of the components comprising the elements aluminum, silicon and titanium, expressed as a wt%,_are determined by X-ray diffraction; and wherein the ash particles are the product of incineration of a material comprising a wastepaper deink residue; wherein the wt% of CaO and the sum of the components comprising the elements aluminum, silicon and titanium, expressed as a wt%,_are determined by X-ray diffraction; and wherein the ash particles are the product of incineration of a material comprising a wastepaper deink residue; forming an aqueous slurry of the ash particles, wherein the water used to form the slurry, prior to addition of any optional additives, comprises not more than 500 mg/liter elemental calcium; and wherein other optional materials that are not sources of calcium are not more than 5 wt% of the slurry when all materials have been added to the slurry; and wherein the water used to form the slurry, prior to addition of any optional additives, comprises not more than 500 mg/liter elemental calcium; and wherein other optional materials that are not sources of calcium are not more than 5 wt% of the slurry when all materials have been added to the slurry; carbonating the aqueous slurry to form composite precipitated calcium carbonate particles; wherein no wet milling is performed; and wherein either the only sources of calcium are from the ash particles and the water used in forming the slurry of the ash particles; and no source of calcium is added to the material to be incinerated or to the incinerator; or a source of calcium is added to the material to be incinerated, to the incinerator, to both the incinerator and material to be incinerated, at another point in the process, or a combination thereof, such that the ratio of the weight of calcium added, expressed as elemental calcium, to the weight of ash, is not more than 1.0. the only sources of calcium are from the ash particles and the water used in forming the slurry of the ash particles; and no source of calcium is added to the material to be incinerated or to the incinerator; or a source of calcium is added to the material to be incinerated, to the incinerator, to both the incinerator and material to be incinerated, at another point in the process, or a combination thereof, such that the ratio of the weight of calcium added, expressed as elemental calcium, to the weight of ash, is not more than 1.0.