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Updated: May 10, 2025
A work of art ought to set the poetical faculty in us to work, it ought to stir us to imagine, to complete our perception of a thing. And we can only do this when the artist leads the way. Mere copyist's painting, realistic reproduction, pure imitation, leave us cold because their author is a machine, a mirror, an iodized plate, and not a soul.
M. Natterer, of Vienna, discovered a process for obtaining proofs on iodized plates with the chloride of sulphur, without the use of mercury.
Experience proves that the common impressions, iodized to a rather light yellow gold tint, and brought by the bromine to a very light, rose color, have their whites very intense, and their deep shades very black.
The plate iodized to a dark orange yellow, or tinged slightly with incipient rose color, coated over the accelerator to a deep rose red, then back over iodine one-tenth as long as at first coating, gives a clear, strong, bold, deep impression. I will here state a singular fact, which is not generally known to the operator.
A plate of silver is iodized in the usual manner, and then placed on the top of a vessel six or eight inches high, having at the bottom, in a small cup, a few drops of chloride of sulphur; it should remain exposed to the action of the vapor until the sombre yellow color is changed to a red, after which it is brought to a focus in the camera, where it is exposed to the light in the camera, for about the time necessary to produce an ordinary daguerreotype.
The marshes were too soft to hold up anything so small as a hoof, so when farmers used horses there, they fastened broad wooden shoes on the horses' feet. Nowadays, though, horses were giving place to tractors. The air had an increasingly queer smell, like iodized salt in boiling potatoes.
In less than a minute the syrupy fluid has dried, and appears like a film of transparent varnish on the glass plate. We now place it on a flat double hook of gutta percha and lower it gently into the nitrate-of-silver bath. As it must remain there three or four minutes, we will pass away the time in explaining what has been already done. The syrupy fluid was iodized collodion.
If the plate be iodized only to a light-yellow, the result might be of a bluish or grey tinge: and this is generally the case, when the quick is new and strong, and there is an excess of it on the plate, and yet not enough to form the bromide iodide of silver; in which case it would wholly spoil the impression.
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