The next process we practice in class with teacher Omaira Abadia was the classical Salt Print Process also known as Calotype or Talbotype, using negatives made printing or photocopying over acetate, and objects to make photograms.
We used this formulae for all the 12 in class you can make reductions according to your needs:
For coat the paper and fix the salt emulsion over it:
- Gelatin: 10 grams
- Distilled water: 100 cc
- Silver Nitrate (handle with care): 10 grams
- Sodium Chloride: 20 grams
- Sodium Citrate: 10 grams
- Distilled water: 1000 cc
Remember always use chemicals under a low or security light and use gloves, cover your eyes and preferably wear work clothes.
Te learn the process are many links online, one of my favorite sites is AlternativePhotography.com, is a wonderful place.
And for more examples you can visit some Flickr or DeviantArt groups.
Exposure times vary from 7 to 15 minutes, then a wash and fixer. With more time in fixer the image will enlighten.
These images are cell phone captures of some of the sensitized papers under sun and my assistant helping me to decide which objects I will put in contact with the materials.
These ones are scans of some of the Talbotypes after fixer:
Finally some of the images are in hands of friends: Carlos Bernal, Caro Alarcón and my bro Jef, the idea is to see what kind of work they can make over it; my bro Yuluts already make this drawing: