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Weather Glasses were used commonly around the early 16th and 17th centuries. Weather Glasses are barometers that will accurately forcast the weather. Bad or stormy weather means low pressure and is indicated by the rising of the water in the weather glass spout from 4 to 12 hours in advance. Sunny or fair weather means high pressure and is indicated by the falling water in the weather glass. Blue food coloring is sometimes added to the water to give the weather glass a more attractive look.