“For decades, chalk and alum have been added to bread, and burnt corn and peas ground up to make coffee. Vinegar is rendered sharper by the addition of sulphuric acid, arrowroot is added to milk to thicken it, mustard is eked out with flour, strychnine is added to beer for bitterness and green vitriol to encourage a foaming head. And these are but the harmless manipulations.”
