Anthotype

Rhododendron leaf and ivy leaf on photo paper for printers, sensitized with beetroot juice 10x15 cm

Anthotype, Red Cabbage, blue color due to high ph level of the paper.

An anthotype is an image created using photosensitive material from plants. This process was originally invented by Sir John Herschel in 1842. An emulsion is made from crushed flower petals or any other light-sensitive plant, fruit or vegetable. A coated sheet of paper is then dried. Place some material, for example leaves or a transparent photo positive on the paper and expose to direct full sunlight until the image is bleached out by the sun rays. The color remains or fades in the shadowed parts. The paper remains sensitive against such rays.

History

The photo-sensitive properties of plants and vegetables have been known to scholars for centuries. Among many early observations the experiments of Henri August Vogel in Paris are of particular interest. He discovered in 1816:

An alcoholic tincture of either red carnations, violets or corn poppy turned white behind blue glass in a few days, while it remained unchanged behind red glass after about the same time. Cotton and paper colored with these tinctures exhibited the same differences.

Later that century Herschel attempted to invent a color process, he tried several flower and plant emulsions and published his findings. His research resulted in the anthotype process. It should be pointed out that his research into making photographic images from flowers was limited and was ultimately abandoned since no commercial application was feasible from a process which takes days to produce an image. The process continued to be listed in photographic literature of the time but was likely little used.

Over time the process has earned a misleading reputation for being simply too impractical. Image permanence have been brought into question to this day but this problem seems to be mostly related to choice of flower or plant matter.

How it works

From an examination of the researches of Sir John Herschel on the coloring matter of plants, it will be seen that the action of the sun's rays is to destroy the color, effecting a sort of chromatic analysis, in which two distinct elements of color are separated, by destroying the one and leaving the other. The action is confined within the visible spectrum, and thus a broad distinction is exhibited between the action of the sun's rays on vegetable juices and on argentine compounds, the latter being most sensibly affected by the invisible rays beyond the violet.

It may also be observed, that the rays effective in destroying a given tint, are in a great many cases, those whose union produces a color complementary to the tint destroyed, or, at least, one belonging to that class of colors to which such complementary tint may be preferred. For instance, yellows tending towards orange are destroyed with more energy by the blue rays; blues by the red, orange and yellow rays; purples and pinks by yellow and green rays.

— Henry H. Snelling^[1]

Other flower suggestions

Henry H. Snelling writes based on his research: "Viola odorata--or sweet scented violet, yields to alcohol a rich blue color, which it imparts in high perfection to paper. Senecio Splendens--or double purple groundsel, yields a beautiful color to paper."

References

External links

Snelling, Henry H. The History and Practice of the Art of Photography. New York, 1849. on Gutenberg

• The anthotype process
• http://www.alternativephotography.com/wp/processes/anthotypes/anthotypes-making-print-using-plants