Method for manufacturing a slab of artificial agglomerated stone

A method for manufacturing a slab of artificial agglomerated stone comprising:

• a) depositing a first layer of a first mixture onto a surface, wherein the first layer has a first thickness h1,
• b) creating at least one cavity, having a width wi and a length Li, in the first layer, wherein the at least one cavity is defined by at least one cavity wall extending at least partially through the first thickness h1 of the first layer and comprising a first wall portion and a second wall portion in opposition through the at least one cavity width wi,
• c) depositing a second mixture into the at least one cavity of the first layer, forming a second layer by depositing the first mixture and second mixture, wherein the second layer has a second thickness h2,
• d) compacting and hardening the second layer,
• wherein the method further comprises after step c) and before step d),
• inserting a first tool at least partially into the second thickness h2 of the second layer, and
• rotating the first tool around an axis X-X′ essentially parallel to the second thickness h2 of the second layer, wherein the first tool is configured to stir the first wall portion while not stirring the second wall portion, and therefore, the stirring produced by the first tool being rotated while inserted in the second layer transfers the first mixture outside of the areas where the cavities were created and transfers the second mixture inside of the areas where the cavities were created.