[T]he Montgomery Block was the commercial and social center of San Francisco. […] Above [the ground floor] were a law library, the three rooms of the Mercantile Library Association, and a swank billiard room that ran nearly the entire length of the second floor.

The article should be speedy deleted, as a blatant and obvious hoax.

The blue, or cyan, is the most lightfast ink used in the printing process, so it lasts the longest. That blue, incidentally, is the phthalocyanine blue pigment. You can easily test to determine whether any material is lightfast.

At first, making a duplexer seemed impossible, of all the filters in the cell phone, the specifications for the duplexer were by far the most stringent.