the morning dews

A low morning sun triggered this two-tone dew display. Not sure I understand what’s going on so I’m taking a crack at a double refraction idea which seems to work out.

Interesting that the colors are basically just blue- ish and red-ish with nothing in-between. Even secondary rainbows (also formed via double refraction) have a continuity of colors so I’m not sure what’s going on. Maybe has something to do with the shape of water globules since they are not perfect spheres?