Having problems with exposed image - washes out too much - please help
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
BTW this is almost never a problem with the washer/hose. It is almost always an issue with coating/drying method, film density, exposure times and light source, and lastly emulsion... in that order for noobs.
Post a picture of your coated screen before and after development.
I'm also betting you tried to do this 6 times with the same screen in like an hour or so which prolly means you didn't give the emulsion a chance to dry.
I actually tried re-doing the screens over the space of a day, so plenty of time for screens to dry etc. yesterday morning I went back in and did exactly the same process and everything worked perfectly, very strange, gremlins! The only thing I can think if is maybe the exposure unit wasn't functioning normally for some reason. Anyway, thank you for your help, much appreciated