A total lunar eclipse has the direct sunlight completely blocked by the earth's shadow. The only light seen is refracted through the earth's shadow. This light looks red for the same reason that the sunlight looks red, due to Rayleigh scattering of the more blue light. because of it's reddish color, a total lunar eclipse is sometimes called a blood moon Video:
A blue moon is an additional full moon that appears in a subdivision of a year: either the third of four full moons in a season, or a second full moon in a month of the common calendar.
because of the smoke and dust partials in the atmosphere the moon appears blue