Bronze is best known as an alloy of copper and tin, but copper alloyed with aluminum, arsenic, manganese, phosphorous, silicon, etc., can also referred to as bronzes.
Yes, it is, see this 2010 paper Eating artificially ripened fruits is harmful. Calcium carbide is extremely hazardous to the human body as it contains traces of arsenic and phosphorus. It is banned in many countries of the world, but it is freely used in India, Pakistan, Bangladesh, Nepal and other countries. Thus we are at risk of short-term and long-term health effects simply by eating fruits that are induced to ripen. Calcium carbide CaC2 is used to easily generate low levels of ethylene gas which can hasten the (outside at least) ripening of fruits like bananas, mangoes etc.
1 To expedite: Place several avocados in a paper bag and store at room temperature. 2  The fruit emits ethylene gas as it ripens, and the bag captures the gas so it surrounds the fruit effectively. 3  This might take 3-6 days. 4  To expedite faster: Place one or more avocados in a paper bag with an apple and/or a banana. To expedite faster: Place one or more avocados in a paper bag with an apple and/or a banana. 2  The other fruit produces more ethylene gas and hastens the ripening. 3  This might take 1-3 days. 4  Donât do this: eHow recommends rushed ripening in the microwave like this or this. 5  I donât recommend this due to flavor degrading.