Mixture for Silly Putty: Boric Acid and __ Oil
Puzzle 15 of Luxury Desserts Medium Pack
Question is: Mixture for Silly Putty: Boric Acid and __ Oil
and the answer is: SILICONE
Word Meaning:
SILICONE — (chemistry) Any of a class of inert, semi-inorganic polymeric compounds (polysiloxanes), that have a wide range of thermal stability and extreme water repellence, used in a very wide range of industrial applications, and in prosthetic replacements for body parts.
Definitions from Wiktionary.