The Tiffen ND 3.0 provides exactly 10 stops of light reduction, which is equivalent to an optical density of 3.0 or a filter factor of 1000x.
While Tiffen's ColorCore technology minimizes shifts, 10-stop filters may introduce a slight warm or cool cast depending on the light source, which is easily corrected in post-processing.
No, the ND 3.0 is not safe for direct solar viewing or photography. It does not block sufficient Infrared (IR) or Ultraviolet (UV) radiation to protect your eyes or camera sensor.