rt can produce.
When in the operator's judgment the operation has arrived at the
highest state of perfection, rinse suddenly, with an abundance of clean
water, and dry as before described.

When an impression is dark, the gilding process may be longer
continued; but when light, it should be gilded quickly, as lengthening
the time tends to bleach the impression and make it too white. The
cause of this appears to be, that with a moderate heat the chlorine is
merely set free from the gold, and remaining in the solution, instead
of being driven off, with its powerful bleaching, properties, it
immediately acts upon the shades of the picture. A dark impression can
thus, by a low heat, long-continued, be made quite light. To procure
the best effect, then, heat suddenly with a large blaze, and judging it
to be at the maximum, cool as suddenly as possible.

When the hyposulphite of gold is used instead of the chloride, a less
heat should be employed.

Coloring Daguerreotypes.--Of all the so-called improvements in the
Daguerreotype, the coloring is the least worthy of notice. Yet the
operator is often, in fact most generally, called upon to hide an
excellent specimen under paint. I can conceive of nothing more perfect
in a Daguerreotype than a finely-developed image, with clearness of
lights and shadows, possessing the lively tone resulting from good
gilding. Such pictures, however, are not always had, and then color
may perform the part of hiding the imperfections. We present the
following method as given in Willat's Manual:

"Daguerreotype portraits are now commonly met with beautifully colored;
but the coloring is a process requiring great care and judgment, and
many good pictures are spoiled in fruitless experiments. Several
different methods of coloring have been proposed. The simplest mode
appears to be that of using dry colors prepared in the following
manner: A little of the color required, very finely ground, is thrown
into a glass containing water, in which a few grains of gum arabic have
been dissolved. After standing a few moments, the mixture may be
passed through bibulous paper, and the residue perfectly dried for use.
The principal colors used are Carmine, Chrome Yellow, Burnt Sienna,
Ultramarine and White; boxes fitted with sets of colors properly
prepared, may be obtained of the dealers, and include Carmine, White,
Lilac, Sky Blue, Pink, Yellow, Flesh color, Orange, Brown, Purple,
Light Green, Dar