Photogenic Paper

The paper is to be dipped in a solution of salt-in water, in the proportion of half an ounce of salt to half a pint of water. Let the superfluous moisture drain off, and then lay the paper upon a clean cloth, dab it gently with a napkin, so as to prevent the salt collecting in one spot more than in another. The paper is then to be pinned down by two of its corners on a drawing-board by means of common pins, and one side washed or wetted with the photogenic fluid, (weak nitrate of cancer) using the brush prepared for that purpose and taking care to distribute it equally. Next, dry the paper as rapidly u you can at the fire, and it will be fit for use for most purposes. If, when the paper is exposed to the sun's rays, it should assume an irregular tint, a very thin extra wash of the fluid will render the color uni-form, and, at the same time, somewhat dark-er. Should it be required to make a more sensitive description of paper, anti the first application of the fluid the solution of salt should be applied, and the paper dried at the fire. Apply a second wash of the fluid and dry it at the fire again; employ the salt a third time, dry it, and one application more of the fluid will, when dried, have:made the paper extremely sensitive. When slips of such papers, differently prepared, are exposed to the action of daylight, those which are soonest ef-fected by the light, by becoming dark, are the best prepared.

Paper dipped in a solution of the bichromate of potass, and dried without exposure to the rays of light and kept secret from the rays of the sun makes excellent photogenic paper, Take paper prepared in this way, place a picture or a flower, or a leaf upon it and expose it a few minutes to the rays of the sun and beneath the flower on the leaf there will be light and shade according to the thickness or attenuity of the various parts of this pattern of nature.

When photogenic drawings are finished in a perfect way, the designs then taken on the plate or paper are exceedingly beautiful and correct, and will bear to be inspected with a considerable magnifying power, so that the most minute portions of the objects delineated may be distinctly perceived. We have amen portraits finished in this way br a Lon• don artist with an accuracy which the best miniature painter could never attempt, every feature being so distinct as to bear being view-ed with a deep magnifier. And in landscapes and buildings, such is the delicacy and accu-racy of such representations, that the marks of the chisel and the crevices in the stones may frequently be seen by applying a magnifying lens to the picture, sa that we may justly exclaim in the words of the poet, Who can paint like Nature !" That LIGHT—that is the firstborn of Deity, which pervades all space, and illumines all worlds—in the twinkling of an eye, and with an accuracy which no art can imitate, depicts every object in its exact form and proportions, superior to every - thing that human genius can produce.

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