Jewels of the Toad
Almost anything can happen when certain chemicals get together in the correct proportion—even a time blast!
Originally published in the October, 1943 issue of Fantastic Adventures. Extensive research has not revealed the necessary renewal od copyright, so this is believed to be in the public domain.
Cover by me.
Here is Jewels of the Toad by Frank Patton, in epub format.
An audio version of this story appeared on Episode 44: Jewels of the Toad of the StoryHack podcast.