Photography a Treatise On the Chemical Changes Produced By Solar Radiation An
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This powder must be kept in a dark vessel, and in a dry place. For a plate six inches by five, as much of this compo- sition as can be taken up on a shilling is sufficient. It is to be laid in the centre of the copper, and the figures being wetted, to be quickly rubbed over every part of the plate, adding occasionally 176 IJdPROVEMEXTS IN DAGUERREOTYPE.
a little damp salt. The copper being covered with the silvering, it is to be speedily well washed in water, in which a little soda is dissolved..., and as soon as the surface is of a fine silvery whiteness it is to be dried with a very clean warm cloth. In this state the plates may be kept for use. The first process is to expose the plate to the heat of a spirit flame, until the silvered surface be- comes of a well-defined golden-yellow colour ; then, when the plate is cold, take a piece of cotton, dipped in very dilute nitric acid, and rub lightly over it until the white hue is restored, and dry it with very soft clean cloths. A weak solution of the hydrio- date of potash, in which a small portion of iodine is dissolved, is now passed over the plate with a wide camel's hair brush.
What to read after Photography a Treatise On the Chemical Changes Produced By Solar Radiation An?
You can find similar books in the "Read Also" column, or choose other free books by Hunt, Robert, 1807-1887 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This powder must be kept in a dark vessel, and in a dry place. For a plate six inches by five, as much of this compo- sition as can be taken up on a shilling is sufficient. It is to be laid in the centre of the copper, and the figures being wetted, to be quickly rubbed over every part of the plate, adding occasionally 176 IJdPROVEMEXTS IN DAGUERREOTYPE.
a little damp salt. The copper being covered with the silvering, it is to be speedily well washed in water, in which a little soda is dissolved..., and as soon as the surface is of a fine silvery whiteness it is to be dried with a very clean warm cloth. In this state the plates may be kept for use. The first process is to expose the plate to the heat of a spirit flame, until the silvered surface be- comes of a well-defined golden-yellow colour ; then, when the plate is cold, take a piece of cotton, dipped in very dilute nitric acid, and rub lightly over it until the white hue is restored, and dry it with very soft clean cloths. A weak solution of the hydrio- date of potash, in which a small portion of iodine is dissolved, is now passed over the plate with a wide camel's hair brush.
What to read after Photography a Treatise On the Chemical Changes Produced By Solar Radiation An?
You can find similar books in the "Read Also" column, or choose other free books by Hunt, Robert, 1807-1887 to read onlineMoreLess
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