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@fallen-archie wrote:

 'even the Victorians went to some lengths to identify poisonous liquids by making the bottles in a specific colour and adding ridges which assisted the visually impaired, sensible of them'.

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Pity they weren't as conscientious about the warning in the use of arsenic in the manufacture of their wallpapers. Because the 'en trend' colour was green at one stage, dear old ladies of independent means were dropping like flies in their drawing rooms.

And speaking of flies, their fly-papers were heavily impregnated with it also.