Glad to know people are still using TD-3 after all these years. My favorite agitation technique was 20 seconds every 3 minutes, but some might find the resulting effects too extreme. As Harry says, tone gradation at large magnification will always be smoother at 4x5, but I thought I achieved a beautiful kind of effect I describe as marbly with TD-3 and I am glad it has survived as long as it has. I always worry that people will expect too much from it and be disappointed.(posted 8643 days ago)