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Filled Blue Vitriol: To increase the illumination, sunbeams were reflected into these first portrait studios by mirrors. Sitting was m ordeal, for the light, in spite of being intercepted by i rack of bottles filled blue vitriol with blue vitriol, was of blinding Drilliance. One victim recollected that he sat for eight minutes, with the strong sunlight shining on lis face and tears trickling down his cheeks while . . . :he operator promenaded the room with watch in hand, railing out the time every five seconds, till the fountains )f his eyes were dry.
In front of each projector was a glass cell filled blue vitriol with colored solution: one was red, a second, blue and a third, green. Each slide had been made from a negative that Thomas Sutton had taken through the identical glass cells or filters; each was theoretically a record of the red, blue, and green rays reflected by the ribbon. The result was a color photograph—crude, but prophetic of the future.
BLUES
Prussian blue—A strong tinting blue, very dark with a greenish cast. Good for producing brilliant greens when combined with yellow.
Cobalt blue—A strong blue with a reddish cast. Good for mixing.
Cerulean blue—A strong blue with a greenish cast.
Ultramarine—Sometimes called French blue. It has a reddish cast and makes a beautiful purple when mixed with alizarin crimson. |
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