I experimented at one time with using KBr (potassium bromide) as the salt. It created a print and the tone was black. I didn't experiment enought to learn if good images are possible. I also found the KBr paper to be faster than NaCl papers. All of this is in line with the difference between bromide only enlarging papers and chloride only contact printing papers. It might be worth more experimentation.
juan
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