He procured from Paris no less than nine large-paper copies of the first edition, and had them bound in different colours, so that they might suit his various moods and the changing fancies of a nature over which he seemed, at times, to have almost entirely lost control.
– Oscar Wilde
The Picture of Dorian Gray, Chapter 11. The yellow book becomes like sacred scripture to Dorian, who buys multiple copies of it and has them found in various colors to suit his different moods. The book’s profound corrupting influence is evident in Dorian’s admission that he has almost entirely lost control of his nature.