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50:. Opalotypes exploited two basic techniques, using either the transfer of a carbon print onto glass, or the exposure of light-sensitive emulsion on the glass surface to the negative. Opalotype photography, never common, was practiced in various forms until it waned and disappeared in the 1930s. "Milk glass positive" is another alternative term for an opalotype.
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Opalotypes were printed on sheets of opaque, translucent white glass; early opalotypes were sometimes hand-tinted with colors to enhance their effect. The effect of opalotype has been compared "to watercolor or even pastel in its softer coloring and tender mood." "Opalotype portraits...for beauty and
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Opalotype is one of a number of early photographic techniques now generally consigned to historical status, including
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The basic opalotype technique, involving wet collodion and silver gelatin, was patented in 1857 by Glover and Bold of
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Mentzer, Jennifer Jae. "The
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and are practised by a small number of dedicated artists.
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Love and Loss: American
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delicacy of detail, are equal to ivory miniatures."
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178:Alternative Photographic Processes web site
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140:Oxford, Focal Press, 2007.
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