With Kodak's two part toner it really is trial and error. The tone you will get depends not only on the time in the bleach but the type of paper as well. With neutral tone papers, you most often have to bleach for a few minutes before the image begins to fade. Warm tone papers react much sooner and the effect varies with brands. For instance, I use Luminos Charcoal R quite a bit and this paper, which is quite warm, reacts very quickly in the bleach. 30 seconds to a minute and a half results in a very warm sepia tone. Any longer than that and I end up with chocolate brown. Same goes with Forte Fortezo which I use extensively for portraits. With this paper, a very quick bleaching (30 to 60 seconds) followed by 5 minutes or so in part B results in beautiful skin tones. If your first attempt is disappointing, don't be discouraged. It takes time to get used to it. Try different times in the bleach, different papers, etc. It's not an exact science so experiment and have fun.(posted 9011 days ago)good luck,
Walter