It is rough and opaque. An example is like the frost in a home freezer. Clear Ice Clear ice forms a hard and glossy surface. It develops when water droplets which touch the airplane flow across the surface before freezing. This ice can accumulate as a smooth sheet.
Clear ice is likely to form in areas of large water droplets, such as in rain or cumuliform clouds.
Mixed Ice Mixed ice forms a hard rough conglomerate. It develops when precipitation droplets vary in size. It has an opaque and very rough surface. Clouds and Icing Icing can occur in clouds any time subfreezing temperatures are reached and is governed by water droplet size and distribution. Small water droplets are the most common in fog and low-level clouds.