and to another pint add sixty grains of hyposulphite of soda.
When dissolved, pour the gold solution into the hyposulphite
by small quantities, shaking well after each addition.
The soda solution must not be poured into the gold, as the gold
would be immediately decomposed, and the solution turn black,
and be unfit for use.

Some operators add muriate of potash and other substances,
but these do not possess any advantage except in cases where it
is necessary to bleach the solarized portions of the impression,
and when such is the case, chloride of sodium (common salt)
is probably as effective and is the most convenient.
Add about a teaspoonful to two ounces of the gilding.

Solution, for Increasing the Brilliancy of the Daguerreotype.--This solution
will have the effect to thoroughly cleanse the surface of the gilded plate
and excite a powerful influence on the general character of the impression.
To a solution of three ounces of water, in which is dissolved a quarter of an
ounce of cyanide of potassium, add one teaspoonful of a solution containing
six ounces of water and half an ounce of each pure carbonate of potash,
alum, common salt, gallic acid, sulphate of copper, and purified borax.
While the plate is wet, pour on a little, and heat it with a powerful blaze.
The effect will be quickly produced, in from three to fifteen seconds.
Rinse and dry, as in the gilding.

Bleaching Solution.--Make a saturated solution of muriate of ammonia
(sal ammoniac) in pure water, and filter through paper.
Reduce with an equal quantity of water when used. When the linen
or any other portion of the impression is badly solarized,
after removing the coating, rinse with water; then pour this