Authentication 
1) Colors: Grey, yellow, white, pink and so on.
2) Widely used for curbstones in garden, commercial and residential, Building areas, plazas, seacoasts, railways and port station, construction.
3) Finishes: Fine picked, axed, sawn, bush hammered, flamed and water-sandblasted
4) Packing: Strongly fumigated wooden crate
