A demolding kit for concrete products to be molded and demolded. The demolding kit comprises a deformable mold having two rigid spines, a longitudinal mold volume extending transversally to the spines for molding a product, and a resting face opposed to the mold volume; and a bed having a non-matching shape relative to the resting face of the deformable mold. Clearance between the resting face and the bed about at least one of the spines is present when the resting face rests on the bed without exterior force applied thereon. The deformable mold is configured to have the resting face at least partially adopting the shape of the bed when exterior face is applied on the spines, thereby at least partially releasing the product from the mold volume.

Provided herein are a method and a system for producing slabs, tiles or sheets of artificial stone, with a wide vein effect, comprising inorganic particles of different sizes and hardened binders, and which simulate the appearance of natural stone.