Opalotype

The effect of opalotype has been compared "to watercolor or even pastel in its softer coloring and tender mood.

"[1] "Opalotype portraits...for beauty and delicacy of detail, are equal to ivory miniatures.

"[2] The basic opalotype technique, involving wet collodion and silver gelatin, was patented in 1857 by Glover and Bold of Liverpool.

Opalotype photography, never common, was practiced in various forms until it waned and disappeared in the 1930s.

Opalotype is one of a number of early photographic techniques now generally consigned to historical status, including ambrotype, autochrome, cyanotype, daguerrotype, ivorytype, kallitype, orotone, and tintype.