So smooth - So easy. A 3-phase fast set alginate impression material. Excellent for creating impressions of hands, fingers, feet and bite marks. packaged in 1 lb. tubs for easy storage and handling. So easy to mix and extremely sensitive to fine detail. Just add water and mix vigorously until a homogeneous paste is obtained. When mixture turns pink, fill the impression tray/bowl. When mixture turns white it is set. Water based material can be followed up with a permanent cast with Royal Rock. Dust Free!