Ice that was generated by the aircraft's airframe. The velocity of the object with respect to the air. The size and shape of the object. Thus, the ice accretion rate are greater on sharper leading edges. Rime Droplets freeze on contact with the airframe.
Air is trapped in the ice causing an opaque appearence.
Terms Rime is generate in air temperatures 10F and below Between 10F and 25F, a Glaze-Rime formation will occur. While Glaze Ice occurs at total temperatures of 25F to 30F Ice accretion on an aircraft requires a flight path through a supercooled cloud that is in a thermodynamically unstable. Whereas, the slightest perturbation such as an impact with an equally cooled surface will result in freezing. These spontaneous phase changes from liquid water drop to a solid crystalline phase is an irreversible entropy-driven reaction. The increase in specific entropy accompanying the addtion of heat to a unit mass of gas at a speific temperature.