I have been screen printing for a while and today have had a major problem with one of my designs. After exposing the image, i go to wash it out, this starts off okay, but i have to stop because some areas wont wash out and others seem to wash out too much, leaving the image ruined. I repeated the process 6 times before i finally gave up. I've never had this happen before. I didn't add any more hose pressure than on previous days. The image is very detailed, but no more than other days that have been successful.
The photo emulsion is a couple of months old, but it is kept in the fridge. last week everything was fine, any suggestions appreciated