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action added adulterated alcohol alloy ammonia amount analysis aniline appears applied atmosphere becomes bismuth blue body boiling candle carbon carbonic acid cause cent chemical chloride colour combination Communications compound considerable containing copper crystals dissolved distilled effect employed examined exist experiments fact filter flame force give given grains green heat hydrochloric hydrogen important instance iron kind known lead less light lime lines liquid manner matter means metal method mixed mixture nature nitrogen observed obtained ordinary oxide oxygen passed platinum portion potash potassium precipitate prepared present produced properties proportion pure quantity reaction remains remarkable removed salt separated silver Society soda soluble solution steel substance sufficient sulphuric acid surface taken temperature tion tube vapour vessel weight yellow zinc