I would only use high-contrast developer such as paper developer. Also Kodak D-19 is excellent. I've had very good results using Tetenal Eukobrom for instance. I think any paper developer can do.
Originally Posted by NDP_2010
Negative developers are not convenient in that you have to tweak them in order to obtain a decent contrast.
You sure can do it, for instance adding some sodium carbonate or some sodium hydroxide.
With paper developer you eliminate one possible variable (hopefully choose and use the same developer in your tests).