I have the following events in mixpanel:
I'm aware the orange one is because it is a Ruby triggered event, but the blue and the teal are triggered through JS.
What does the color mean? I could not find any caption on the web.
The color is actually randomly determined, it is not at all dependent upon the event or its' properties. If you were to examine a different user's activity feed, there's a good chance you'd find the "Login" event under a different color.