A fun & all natural project, we just love these! Hours of fun outdoors with these natural paints and sponges in fun shapes. Just add water to the sponges and watch them grow! Getting started: Mix paint with equal part water and powder in tray. Run water over compressed sponges (or dunk them in water) to begin soaking up paint and stamping away! These stamp kits are all-natural with a rice flour and clay base mixed with vegetable dyes to create bright, fun colors while wet. When dry, the color fades to white.