Question: What kind of chocolate melts at a lower temperature?
About the article "Chocolate", section "Tempering".

Candidate passages:
Cocoa butter is a major ingredient in practically all types of chocolates (white chocolate, milk chocolate, but also dark chocolate).
This application continues to dominate consumption of cocoa butter.
Pharmaceutical companies heavily use cocoa butter's physical properties.
As a nontoxic solid at room temperature that melts at body temperature, it is considered an ideal base for medicinal suppositories. 
Ganache (; from the French word for "jowl") is a glaze, icing, sauce, or filling for pastries made from chocolate and cream.
Ganache is normally made by heating cream, then pouring it over chopped chocolate of any kind.
The mixture is stirred or blended until smooth, with liqueurs or extracts added if desired.
Depending on the kind of chocolate used, for what purpose the ganache is intended, and the temperature at which it will be served, the ratio of chocolate to cream is varied to obtain the desired consistency.
Typically, two parts chocolate to one part cream are used for filling cakes or as a base for making chocolate truffles, while one to one is commonly used as a glaze.
Cooled ganache can be whipped to increase volume and spread to cover a cake.
However, if left to cool too much it can become too thick and unspreadable. 
 Baking Dark Chocolate Baking Milk Chocolate Baking White Chocolate Baking Chips Dark Chocolate Baking Chips Milk Chocolate Baking Chips White Chocolate Bournville Cocoa Melts Dark Chocolate Melts Milk Chocolate Melts White Chocolate  
The process differs from diffusion bonding in which diffusion occurs when a melting point depressant element from an interlayer moves into lattice and grain boundaries of the substrates at the bonding temperature.
Solid state diffusional processes lead to a change of composition at the bond interface and the dissimilar interlayer melts at a lower temperature than the parent materials.
Thus a thin layer of liquid spreads along the interface to form a joint at a lower temperature than the melting point of either of the parent materials.
A reduction in bonding temperature leads to solidification of the melt, and this phase can subsequently be diffused away into the parent materials by holding at bonding temperature. 
A melting furnace is necessary only when spin casting with metal.
Understandably the metal must be in a molten state prior to introduction into the mold.
However, it is necessary for a spin casting furnace to have a temperature controller as there is an approximate range that works best for each metal.
For example a particular zinc alloy is typically cast between 775-800 °F, whereas it actually melts much lower around 500 °F.
If the metal is introduced to the mold at a higher temperature (in this case, above 800 °F), it will start to wear the silicone down prematurely, greatly shortening the mold life.
If the metal is introduced at significantly lower temperatures (below 775 °F), its solidification time will similarly be shortened resulting in incomplete or low quality castings.
Therefore, spin casting with metal requires not only a furnace with fine temperature control, but knowledge of at what range to cast.