How to use: Just hold the putty in your hands. The heat from your hands will gradually change its color from deep - space blue to ultraviolet purple and then to cosmic pink. Stretch and pull it as you like to create different shapes and your own galaxies. Attention: Keep it away from small children to avoid choking hazards. Do not eat the putty. Maintenance: Store it in a cool and dry place when not in use. If it gets dirty, you can gently wipe it with a clean cloth.