dark vs platinum

dark

noun
  • A dark shade or dark passage in a painting, engraving, etc. 

  • A complete or (more often) partial absence of light. 

  • Ignorance. 

  • Nightfall. 

verb
  • To remain in the dark, lurk, lie hidden or concealed. 

  • To make dark, darken; to obscure. 

  • To grow or become dark, darken. 

adj
  • Off the air; not transmitting. 

  • Ambiguously or unclearly expressed: enigmatic, esoteric, mysterious, obscure, undefined. 

  • Without moral or spiritual light; sinister, malign. 

  • With emphasis placed on the unpleasant aspects of life; said of a work of fiction, a work of nonfiction presented in narrative form, or a portion of either. 

  • Deprived of sight; blind. 

  • Transmitting, reflecting, or receiving inadequate light to render timely discernment or comprehension: caliginous, darkling, dim, gloomy, lightless, sombre. 

  • Having racing capability not widely known. 

  • Marked by or conducted with secrecy: hidden, secret; clandestine, surreptitious. 

  • Conducive to hopelessness; depressing or bleak. 

  • Lacking progress in science or the arts. 

  • Extinguished. 

  • Dull or deeper in hue; not bright or light. 

  • Having an absolute or (more often) relative lack of light. 

  • Extremely sad, depressing, or somber, typically due to, or marked by, a tragic or undesirable event. 

platinum

noun
  • A whitish grey colour, like that of the metal. 

  • A single or album that has achieved platinum sales, i.e. over 1 million or 2 million. 

  • A platinum-based drug: a platin. 

  • The chemical element with atomic number 78 and symbol Pt; a dense, malleable, ductile, highly unreactive, silverish-white transition metal of great value. 

verb
  • to reach platinum level in a game 

adj
  • Of a musical recording that has sold over one million copies (for singles), or two million (for albums). 

  • Very expensive, or of very high quality 

  • Of a whitish grey colour, like that of the metal. 

How often have the words dark and platinum occurred in a corpus of books? (source: Google Ngram Viewer )