Explanatory notes
… generally in Chapter 74 . Copper phosphide is a very good deoxidiser of copper, increasing the hardness of that metal; … Zinc phosphide (Zn 3 P 2 ). Grey, poisonous powder with a vitreous fracture; gives off phosphine and deteriorates in … phosphides , e.g., hydrogen phosphides (solid, liquid, gaseous), and the phosphides of arsenic, boron, silicon, …