Diamonds of any coulour can be altered by chemicals and heat: a brown diamond included. Note, however, that a natural brown diamond can only be enhanced to appear more 'brown' or a different 'brown', not changed from another colour to brown by these alterations.
All diamonds are formed under high pressure - - and high heat.
Heat and chemicals are two good ways to alter or damage proteins.
Metamorphic rock is altered by heat and pressure.
Ten cents. It's either plated or has been exposed to heat / chemicals that changed its color. As such it's considered to be an altered coin and has no extra numismatic value.
Heat treating any diamond may enhance it, but also devalues it. Heat treating natural diamonds is common, and may include black diamonds. You can read more about the process of heat treating diamonds, below.
We -- humans -- can manufacture diamonds. It takes enormous heat and pressure to produce man-made diamonds.
Limestone.
Metamorphic rock
Metamorphic rock
diamonds
Chocolate will burn at 450.
This goes back to the second theory of thermodynamics....Matter is not created or destroyed...only altered. In this case the wood is altered into fire and the fire produces heat.