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In page Mary Ann Cotton:

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The defence in the case was handled by Thomas Campbell Foster, who argued during the trial that Charles had died from inhaling arsenic used as a dye in the green wallpaper of the Cotton home. The doctor testified that there was no other powder on the same shelf in the chemist's shop as the arsenic, only liquid; the chemist himself claimed that there were other powders. Campbell Foster argued that it was possible that the chemist had mistakenly used arsenic powder instead of bismuth powder (used to treat diarrhoea), when preparing a bottle for Cotton because he had been distracted by talking to other people.[citation needed] The jury retired for 90 minutes before returning a guilty verdict.