Put into an _eau de Cologne_ bottle two drams of chlorate of potass,
and upon that salt about a dozen chips of phosphorous, and fill up
the bottle with cold water: provide a glass tube which will reach to
the potass, through which pour half-an-ounce, by measure, of strong
sulphuric acid, when a gas will instantly rise, give to the liquid a
deep yellow colour, and inflame the phosphorous in a striking manner.