Refer to figures.
Rime Ice

When the supercooled water droplets are small (at very low temperatures) or when cloud droplets are small, the whole droplet freezes on impact, each droplet sticking to the surface it strikes and becoming solid almost at once. Air becomes trapped between each frozen droplet, which makes the ice opaque.

Rime ice, see Figure 16.2, is a white opaque deposit with a light texture. It is caused by small, supercooled water droplets freezing quickly. There is little or no flowback.

The ice grows out from the leading edges and is compacted by the airstream. Some loss of aerofoil shape can occur and air intakes can be affected.

Rime ice can occur in any cloud where there are small supercooled water droplets: Ns, As, Ac, SC, St and the parts of heap clouds where supercooled water droplets are small.