| abstract |
Artificial variegated marble is produced from natural stone in particulate form, i.e. in the form of powder or granules, by a method which comprises providing individual batches of color components consisting of the particulate natural stone, powdered thermosetting resin, powdered catalyst for the resin, and a pigment, mixing together the individual batched of color components in a container to form a heterogeneous mixture wherein said individual batches still have retained their separate identities, transferring the heterogeneous mixture to another container to effect at least one re-stratification, and subjecting the mixture to a moulding treatment under increasing temperature and pressure until the resin hardens. |