a few drops (say ten) of bromine, then place a small piece
of phosphorus about one-twentieth of an inch in diameter.
Place the latter on the end of a stick from five to ten feet in length.
So place it that the phosphorus can be dropped into the glass,
and in an instant combustion giving a loud report will be the result.

b. Expose a daguerreotype plate to the vapor of bromine, it assumes
a leaden-grey color, which, blackens by light very readily.
Exposing this to mercury will not produce any decided action upon the lights.
Immerse it in the solution of the muriate of soda, and the parts unacted
upon by light becomes a jet black, while the parts on which the light
has acted will be dissolved off, leaving a clean coating of silver.
This will be a most decided black picture on a white ground.

c. Expose an impressioned plate, that has been sufficient time
in the camera to become solarized, to the vapors of bromine,
and the impression will be fully developed and exhibit no signs
of solarization. The exposure over the bromine most be very brief.
Chlorine or iodine will produce the same result.
The latter is preferable.

Again, should the impressioned plate be exposed too long over the vapor
of bromine, the impression would be rendered wholly insensitive to
the mercurial vapor. Hence this method is resorted to for restoring
the sensibility of the plate when there is reason to believe
that the impression would not be a desirable one; as, for example,
if a likeness of a child be wanted, and it had moved before the plate
had been sufficiently long exposed in the camera, the plate may be
restored to its original sensitiveness by re-coating over bromine,
as above, thus saving the time and labor of re-preparing the plate