Ice
The ice on a tree branch is clear with a dark outline made up of reflections of surrounding elements.
Because ice and snow are forms of water, their characteristics can also be clear, reflective and opaque.
The ice on a tree branch is clear with a dark outline made up of reflections of surrounding elements.
The dark background offers a stark contrast to the clear/white appearance to the icicles that are also reflective.
Snow can appear opaque as in the round contours of snow along the edges of a creek.