Here's what I was doing wrong - as Patrick pointed out in a separate e-mail, very little water should be used when mixing the ascorbic acid with the baking soda. I tried this again last night using 20ml of water to mix 1/2 tsp of ascorbic acid and 1/4 tsp of baking soda. This mix fizzed for about 5 minutes before it stabilized and was then mixed to a total volume of 500ml of water with 5ml of Agfa Rodinal and used to process a roll of 120 TMX for 12 minutes. Agitation was an intial 30 seconds followed by 10 seconds every minute.(posted 8177 days ago)The results with the 1:100 Rodinal and ascorbic acid mix are wonderful. Compared to the straight 1:100 Rodinal and PMK negs of the same scene, the ascorbic acid/Rodinal print was not only dead on the money for contrast (at about EI 64) on Agfa MCP paper (~Grade 2 via no filtration), but the negative printed with considerably finer grain and slightly higher sharpness than the straight 1:100 Rodinal negative, was sharper and finer grained than the PMK negative, and had very very nice gradation of tones with bright highlights and rich shadow detail.