Can anyone identify the cause of the silver area in the center of the attached VDB? I printed this negative this weekend, with one coating, 15 drops, applied with a Hake brush, 15 minutes exposure, and so no issues. This print was made with the same sensitizer, applied with the same Hake brush. However, I applied 15 drops of sensitizer, let that dry and applied another 15 drops to see if I noticed a difference in Dmax. The exposure of this print was also 15 minutes and the silver area was present when i removed the print from the contact frame. The silver area did not change as I processed the print, the other areas demonstrated the expected color changes as I cleared the print and fixed it. My Hake brushes are only used for VDb and do not have metal ferrules. Prints with single coatings made before and after this print did not exhibit any defect like this. This was the only double coating I made this weekend, but have made others on other days and have not seen this issue. After the surface of the sensitizer is dry I put the paper in a drying cabinet. I was having issues with grainy prints and reduced the heat (as well as a few other changes) and have not seen any issues with other double or single coats similar to this one.