Large 9"x 12" Moving Sand Art Pictures The double-strength glass is framed with a quality knotty alder wood frame. The black sand is heavier than the white sand so the two will never mix, some of the sands are transparent and some opaque giving the pictures a cool 3-D effect. Pictures may take from minutes to several hours to finish a magical sandscape, tiny air bubbles hold up the sand creating unique natural scenes with every turn.   Summer Turquoise - a gorgeous Caribbean blue liquid with black, powder white and emerald green pristine sands + fine seafoam glitter