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The time necessary for the exposure can be ascertained by taking out one of the many pieces of glass, applying to the sensitive surface a vitrifiable color, and observing whether the color adheres well.
Westward we see its white cliff rising abruptly from the ocean, corresponding accurately in materials and elevation with those of the opposite shore, and like them, crowned with a venerable load of the same vitrifiable rock.
The invention of M. E. Godard, of Paris, has for its object the reproduction of images and drawings, by means of vitrifiable colors on glass, wood, stone, on canvas or paper prepared for oil-painting and on other substances having polished surfaces, e. g., earthenware, copper, etc.
Many pieces have been preserved that have been painted in vitrifiable colors, the designs are crude, the colors red, yellow, blue, and occasionally black or green. The transparent glass thus painted is said to be of Dutch manufacture. The opalized glass similarly decorated is Spanish. Drinking-glasses or flip-mugs seem to have been most common, or, at any rate, most largely preserved.
But of the Colours which the other Metals may be made to produce in Colourless Glass, and other Vitrifiable Bodies, that have native Colours of their own, I must leave you to inform your self upon Tryal, or at least must forbear to do it till another time, considering how many Annotations are to follow, upon what has in this and the two former Experiments been said already. Annotation I.
«The northern coast of Antrim seems to have been originally a compact body of lime-stone rock, considerably higher than the present level of the sea; over which, at some later period, extensive bodies of vitrifiable stone have been superinduced in a state of softness. The original calcareous stratum appears to be much deranged and interrupted by those incumbent masses.
When the frame has been sufficiently exposed, it is taken into the dark room, the sensitized pieces of glass laid on a plate of glass or marble with the sensitive surface turned upward, and the previously prepared vitrifiable color strewed over it by means of a few light strokes of a brush.
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