Salt Paper

I've made a couple of experiments at Sesc with Salt Paper process using the recipe of "The Keepers of Light" book (starch, sodium citrate and ammonium chloride) It's reasonable simple to make and the results are satisfatory considering the negatives I had in hands. 

These two copies below were made using digital negatives treated in Photoshop, I adjusted the curves aiming to achieve some contrast but more needs to be done. I might try too adding few drops of Potassium Dichromate onto the formula as its known to help increasing the contrast on salt papers.