A new coating on NHL pucks will cause them to change color when they’re reaching the end of their life span and in need of replacement.
The hockey league announced on Monday that is has partnered with PPG Industries to put a thermochromic coating on its pucks for the 2019 NHL Winter Classic, when the Boston Bruins challenge the Chicago Blackhawks at Notre Dame Stadium on New Year’s Day.
From purple to clear when the puck’s temperature is above freezing.@PPG provides @NHL with thermochromic puck coatings for 2019 Bridgestone NHL #WinterClassic.