I am reprinting this info here from Michael Koch-Schulte’s website RNP Array Digital Negatives because I find it extremely useful and also very difficult to locate anywhere else
| Process | logDensity |
| Silver Halide | 1.6 |
| Gum Bichromate | .8 to 1.2 |
| Cyanotype | 1.2 |
| Ware’s New Cyanotype | 1.8 to 2.0 |
| Platinum – Palladium | 1.5 to 1.9 (as high a 2.9) |
| Albumen and Salt | 2.4 |
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