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You may be looking for the short story of the same name.

On Earth, alchemy was a medieval science.

Prior to or during the Thousand Year War, the Kaleds on Skaro mastered alchemy. (AUDIO: The Lights of Skaro)

When the Sheriff of Nottingham had captured Ian Chesterton and was going to execute him, the First Doctor offered to show him the secrets of alchemy in exchange for Ian's release. (PROSE: The Thief of Sherwood)

Abel Gantz was an alchemist, who could change his flesh to any element or shape. He acquired this ability after a laboratory accident inadvertently caused when the TARDIS escaped from the Funhouse (COMIC: Funhouse)

Edward Kelley was a great alchemist (PROSE: Fable Fusion) in the 16th and 17th centuries. (PROSE: Sunday Afternoon, AD 848,988)

In the 17th century, Erasmus Darkening was employed as an alchemist by Lord Marchwood. He made Marchwood and his children vanish. (TV: The Eternity Trap)

Alchemists were rumoured to know the secret of transmutation of metal into gold. In 1866, Theodore Maxtible served the Daleks when they promised to give him the secret. (TV: The Evil of the Daleks)

In an alternate timeline in which he spent three months on Urbinia, the First Doctor delivered "highly commended" lectures about alchemical advances in the Outer Galaxies at Kiria City's university. (AUDIODaughter of the Gods)