(Sarah of the Clue Crew reports from the Steinway & Sons factory in New York.)  Steinway stopped using this material in keys decades ago, & in 1993 the company patented a piano key material made of a substitute for it
[DOC] [TLE] Steinway Parts: Keys and Keyboard - I Love Steinway Grand Pianos [PAR] Nearly a decade before this important decision, Steinway had already 
discontinued using ivory for piano keys.