The Leeds acid that carried arsenic poisoned Manchester drinkers

A batch of arsenic‑tainted industrial sugar traveled from a Leeds factory to Manchester pubs, sickening thousands - how did that expose them?

The Leeds acid that carried arsenic poisoned Manchester drinkers

In this episode, we follow the commercial chain that funneled a contaminated industrial ingredient into everyday beer and the medical, industrial, and social blind spots that let workers be misdiagnosed. What decisions and routines allowed arsenic to travel from factory to pint glass unnoticed?

Person: Bostock and Company; John Nicholson and Sons Date: March 1900 (change in acid) Location: Leeds → Garston → Manchester Event: Arsenic contamination of sulfuric acid used to make inverted sugar Topic: Large outbreak of peripheral neuritis among heavy beer drinkers

- Nicholson supplied sulfuric acid to Bostock from 1888; in March 1900 the acid was unrefined and contained arsenic. - Bostock used the acid to hydrolyse sugar into inverted sugar, a common cheaper fermentable for breweries. - Breweries such as Groves and Whitnall received the inverted sugar and distributed beer by the barrel across Manchester’s pubs and clubs. - For four months doctors recorded peripheral or alcoholic neuritis in heavy working‑class drinkers without testing for arsenic exposure. - Statistical comparison shows a sharp rise in neuritis deaths in the outbreak months versus the previous year, prompting questions about supply and oversight.

To listen to this podcast ad-free and access premium episodes, try our subscription with a 14-day free trial at obomedia.com.

© 2026 OBOMEDIA. All rights reserved. This episode and its content (audio, text, and related materials) are the exclusive property of OBOMEDIA and are protected by applicable copyright laws. Reproduction, distribution, editing, or commercial use, in whole or in part, without prior written permission from OBOMEDIA is prohibited. For permissions, licensing, and business inquiries: [email protected].