On boiling the filtered solution, to expel the ammonia, and evaporating the liquid, crystals of narceine are gradually deposited.
If on a saturated solution of narceine a particle of iodine is strewn, fine needle-like grey crystals form around the iodine.
Ammonia dissolves only traces of morphine; but narceine and codeine readily.
The precipitates produced in solutions of narceine and codeine are crystalline and very characteristic.
Papaverine, laudanosine, narcotine, and narceine are four other alkaloids found in opium.
narceine forms good crystals, the form being that of long, four-sided rhombic prisms or fine bushy united needles.
narceine forms precipitates with bichromate of potash, chloride of gold, bichloride of platinum, and several other reagents.