Yesterday I mixed a batch of Wynn White's "ABC" Van Dyke sensitizer. As I added the last few milliliters of Silver Nitrate solution (Solution C) to the previously mixed Ferric Ammonium Citrate (Sol. A) and Tartaric Acid (Sol. B) a silvery-white precipitate formed. It is an odd preciptate, a suspension with a curdled milk look. I mixed the solution twice more and each time had the precipitate. I assume that the precipitate is insoluble silver-something caused by too much silver nitrate in the solution. I found a similar problem reported by Neil Miller: http://www.usask.ca/lists/alt-photo-process/2003/jan03/0479.htm It did produce a decent VDB print this afternoon, so should I filter and forget? Thank you in advance. jason ps: for the record I am using distilled water, my beakers are clean, and my chemicals are all fresh and have all worked in other applications.