User blog comment:DiegoAnime3000/Black is for Polarity/@comment-15145664-20140110234404/@comment-3146930-20140111143845

But if that is the case, that would disprove your theory that Black is for polarity, at least in the same way as Pyrrha. As Sorairo said above, Pyrrha is able to control Polarity, which allows her to control metal and move it as she sees fit (like Magneto). That would include all the positive and negative forces associated with polar forces.

However if Weiss' Bluish-White Glyphs allow her to push things and her Black-Glyph only pulls things, then that isn't polarity as it has nothing to do with magnetic forces and each only work in one direction (positive or negative). However you could make the conclusion that the Black-Glyph creates a gravitational force and the White-Glyph has an anti-gravitational force, but once again this isn't the same as Pyrrha's polarity semblance.