Hi Todd,

It depends - if you're using RC papers, you'll probably get away without using stop bath. If you're using FB papers, you might experience brown or mauve staining caused by developer carried over into the fixer, especially on prints larger than (say) 10x8". I'd say that if you're making fine prints to sell or exhibit, play safe, use fresh stop bath (exhausted stop is about as useful as a wet fish finger) and soak the print for at least two minutes. Modern papers don't seem quite as prone to this, and you might get away with it, but when you've ruined a few sheets of expensive paper you'll start to wish you'd bothered using a stop bath! Ask me how I know... :-)