I bought a bottle of De Atramentis Black Document ink because I was not happy with the colour of Diamine Registrars ink. I love the black, but am having awful problems with it in my pen. I've used it in my Italix Parsons Essential with medium nib. After four days the pen was completely blocked, and the photo shows what came out of it when the section and feed were put in cold water. (Sorry for the reflection across the photo) I cleaned the pen thoroughly and tried again, adding a couple drops of dish soap to the ink. This has helped somewhat, as so far the pen has not got blocked again, but it is a very hard starter now. I have to twist the converter each time, to push some ink into the feed to get it going. Is there anything else I can do with this ink, to make it practical to use, or should I give up on it? I can't see myself flushing it out after every use. Should I just buy a dip pen to use with it, even though the label says 'Exclusive handmade ink for use in fountain pens'. I would be very interested to hear others experiences of this ink.