For example, in The Exploits of the Chalet Girls (Chambers, 1933), Evadne Lannis:
decided that she must liven things up a little . . . she got off her seat and brought a little of the sulphuric acid prepared for them. But in getting it, she also helped herself to a jar of some blackish-grey powder . . . Removing her crucible from the bunsen burner, Evadne cautiously tipped a little of the powder on to the crystalline substance. Then she added the sulphuric acid, and set the vessel back, turning up the burner to full strength. . . The mixture fulfiled the young American's wildest hopes, for almost as she turned up the burner, there was a prolonged "his-s-s-s!" and the whole contraption went up in an explosion that resounded through the building, even reaching faintly to Le Petit Chalet; while fumes of the most noxious description filled the room . . . not a pane of glass in the room remained intact. (pp246-7)