. . . be entertained by any persons who have the least knowledge of the manner in which the vegetable acid will corrode iron. Those who are acquainted with culinary processes must know in what manner the acid of onions will operate upon any steel instrument; it corrodes a knife so as to turn the onions black with the particles eaten away from the edge and the face of the blade. To avoid this unwholsome and unseemly inconvenience, a wooden instrument is generally used in all instances where onions form a part of the cookery appendages. It is consequently evident, that although iron utensils are now greatly used instead of copper, yet many injurious effects may happen from their being liable to be corroded by the acid of several vegetables. And if the nitrous acid of the air will corrode iron so as to cause rust, when it will not produce the proportionate effect upon copper, it is a demonstration that iron is the most liable to such a corruption. The corrosions of copper are undoubtedly perni. . . Read More