Very good images, andrious! My guess is that the citric acid successfully clears, or nuetralizes, the remaining sensitizer, but perhaps more washing before toning is needed to completely remove it.
Thomas, this probably is not related to your question, but I have noticed with my pt/pd prints (that I print with a black border), that I do not get a sharp edge between the black of the rebate and high values, such as sky. There is some bleed over into the lighter areas when I put the print into a tray of developer. I solved this by putting the exposed paper in an empty tray and pouring on the developer so that it starts in the middle of the paper and spreads quickly out towards the edge of the paper. It seems the movement of the developer going from the middle and over the rebate prevents the initial bleeding. I finish developing by rocking the tray.
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