Sulphuric acid was added to vinegar for extra sharpness, chalk to milk, turpentine to gin. Arsenite of copper was used to make vegetables greener or to make jellies glisten. Lead chromate gave bakery products a golden glow and brought radiance to mustard. Lead acetate was added to drinks as a sweetener, and red lead somehow made Gloucester cheese lovelier to behold, if not safer to eat. There was hardly a foodstuff, it seems, that couldn't be improved or made more economical to the retailer through a little deceptive manipulation.