Clear ice
Clear ice is a kind of rime ice that can form in nature when the air temperature is between 0 °C (32 °F) and −3 °C (27 °F) by the deposition on exposed surfaces of supercooled, relatively large drops of water (from freezing fog). A rapid accretion and a slow dissipation of latent heat of fusion favor the formation of a transparent ice coating, without air or other impurities.