This article at the CBC.ca website answers a question about a major event in Quebec’s brewing history:
One of the first published reports on cobalt intoxication was in 1967. Called “Quebec beer drinkers’ cardiomyopathy,” doctors described 44 men in their 40s to 60s who were heavy drinkers who died unexpectedly. “There was a suspense element to the story,” recalled cardiologist Dr. Yves Morin of Quebec City. “It took a lot of time and effort to find a cause of the disease.” It turned out the men all drank beer made at the Dow brewery in Quebec City. The brewery had added cobalt to stabilize the beer’s foam.
Here is the actual medical journal from the 1960s on the outbreak. I had heard more about that the brewery had denied responsibility and dumped its inventory in the river than they were putting cobalt in the beer. Cobalt. Yum.