I did some comparison tests today of AZO in Ansco 130 1:1 and Amidol using Michael Smith''s Amidol formula.
Data as below.
1. Paper = AZO #2 (old #2)
2. Exposure = 4 seconds with 65 watt R40 lamp, at 33" from print frame. Test negative was a Stouffer TR 45 step wedge.
3. Develop for two minutes at 72º F. Amidol stright as per MS's formula, Ansco 130 1:1, standard 130 formula.
4. Tone with Rapid Selenium 1:100 for three minutes.
5. Air dry.
6. Read densities and plot curves.
Conclusion. Results were virtually identical. Both developers gave the same exposure scale (ES) of 1.45, Dmax was identical at 1.99, and printing speed at two minutes of development was also virtually identical. The only significant difference was that Anso 130 1:1 has a slightly shorter toe, which results in a curve that is slightly more straight line than the curve of Amidol. Howver, if compared to the typical curves of silver papers other than AZO, the curves of AZO in both Amidol and Ansco 130 1:1 are much more straight line.
After evaluating the tests I made two real prints from a digital negative, exposing both for the same time. I developed one in Amidol, the other in 130. The prints are now dry and they appear to my eyes to be identical. For all practical purposes they are so similar that I can not tell them apart from visual inspection, even when observing them side by side in the same light.
I am attaching three images. The first shows both curves plotted together, the second is the Ansco 130 1:1 curve, the third is Amidol straight.
All of these prints were developed with constant agitation and timed to the second. No water bath was used, either for the test prints or for the *real life* prints.
Last edited by sanking; 09-11-2004 at 10:12 AM. Click to view previous post history.