The Bank of England has announced a new-style £50 note that features engineer James Watt, who is commemorated in Heriot-Watt University's name, and entrepreneur Matthew Boulton.
The new note will be introduced on 2 November. It will be the first time that two portraits will appear together on the reverse of one its banknotes.
The design has seldom changed since it was first introduced in 1725. A white £50 was in use for more than 200 years until 1943.
The Bank says the note will have a range of enhanced security features.
There are 210 million £50 notes in circulation, valued at £10.5bn - 84% higher than seven years ago.