Paraffin with a melting-point of 50° C. or upwards does well.
The precipitate is in the form of rosettes or needles; melting-point 137°.
The hydrochloride is soluble in alcohol and in water, melting-point about 205°.
Such a curve is called the curve of fusion, or the melting-point curve.
The melting-point of pure chloral hydrate is 57, the boiling-point 96-98 C.
Even the insulation in the coils and generators has a melting-point higher than that of porcelain.
Pure tantalum is harder than steel; it may be drawn into fine wire; and its melting-point is very high (about 5100°F.).
The tungsten filament in the most efficient lamps employing it is operating near its melting-point at the present time.
Again, the melting-point is probably a great deal higher for substances under great pressure.
Paraffin with a melting-point higher than 65°C. should be looked upon with suspicion.