I would guess the purple is most likely related to the cool temps along with the fact it's ripening.
Last year when I had a bunch of lady bugs when the light would first come on and the room hasn't warmed up yet. They liked hiding behind the temp gauge on the wall or anywhere it was warmer and they would swarm those areas.
Last year when I had a bunch of lady bugs when the light would first come on and the room hasn't warmed up yet. They liked hiding behind the temp gauge on the wall or anywhere it was warmer and they would swarm those areas.