desiccant vs dry as a bone

desiccant

adj

  • Causing dryness. 

noun

  • A substance (such as calcium oxide or silica gel) that is used as a drying agent because of its high affinity for water. 

dry as a bone

adj

  • completely dry; totally dry 

How often have the words desiccant and dry as a bone occurred in a corpus of books? (source: Google Ngram Viewer )