The melting temperature of a crucible itself is not directly specified in the provided text. However, it does mention the melting points of various crucible materials used in crucible furnaces. For instance, pure platinum crucibles have a melting point above 1770°C, platinum-rhodium alloys have melting points ranging from 1780-1850°C, and platinum-gold-rhodium alloys have exceptional properties with a melting point approaching 1850°C. These temperatures are the melting points of the materials used to make the crucibles, not the temperature at which the crucible itself melts under normal operating conditions. Crucibles are designed to withstand the temperatures required for melting the specific metals or alloys they are intended to handle, without melting themselves. Therefore, the melting temperature of a crucible depends on the material it is made from and its intended use in terms of the metals or alloys it is designed to melt.
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