Laying   Cleaning    
Thorough cleaning of the paving: sprinkle the surface with previously moistened sawdust, and brush until the complete removal of cement residuals, so that the shades of colour of the natural stone are enhanced.

pulizia del porfido

For further info please refer to:

manuale porfido
manuale posa

Two books are available at Consorzio Cavatori Produttori Porfido (Italian and English)