… Colloidal precious metals; inorganic or organic compounds of precious metals, whether or not chemically defined; amalgams of precious metals. …
Explanatory notes
… ‑ Colloidal precious metals; inorganic or organic compounds of precious metals, whether or not chemically defined; … reddish‑brown powder or crystalline mass, very hygroscopic, often presented in sealed flasks or tubes. Tetrachloroauric …