WebWork2: Part A

Calotype:
*Calotype is an early photographic process introduced by William Henry Fox Talbot in 1841
*The process to get a print out image takes about a half hour
~First, you take your best quality drawing and brush it with a solution of silver nitrate. Then you dry the paper, and immerse it in a solution of potassium iodide which forms a light sensitive layer of silver iodide. Next, you treat the surface with a mixture of silver nitrate solution and gallic acid to act as an accelerator. The exposure in the camera, (which must be held in a dark slide) produces an invisible image. You then develop the image by washing it in a mix of silver nitrate and gallic acid, fix it with hypo, and thoroughly wash it.
-You can improve the transparency of your photo with waxing
-A positive can be made by repeating the original process
*There are some negatives and positives to the calotype process compared to it’s competitor Daguerreotype
~Positives:
-You can get unlimited number of prints from one negative
-Retouching is capable on both the negative and the print
-A calotype is easier to examine, and is less delicate
-Can produce warmer tones
~Negatives:
-the materials are less sensitive to light so it takes a longer exposure time
-takes two stages, since you have to make the negative and the positive print
-tends to fade with time
*The negative/positive process used in Calotype is still used today in the standard photographic process
*the Calotype process was used by photographers such as Maxime Du Camp, Henri Le Secq, and Edward Baldus