This is pretty normal for the corners and is actually a sign of not washing enough.
What happens with the lamps we are using, is that they give more light to the centre of the screen and less to the corners. So the corners are undersexposed. What can happen in underexposed areas is that the top part of the emulsion is exposed but the underneath area is still liquid. So the top part wrinkles during washout as you push it around. After it all eventual hardens, from ambient light, you’ll get the pattern you see in your image. If you see this while washing out, it’s a good indicator to keep on working on the area with water, and maybe your finger. If it is slimy to the touch, then you are feeling unexposed emulsion – so keep washing.
Hi Rose,
This is pretty normal for the corners and is actually a sign of not washing enough.
What happens with the lamps we are using, is that they give more light to the centre of the screen and less to the corners. So the corners are undersexposed. What can happen in underexposed areas is that the top part of the emulsion is exposed but the underneath area is still liquid. So the top part wrinkles during washout as you push it around. After it all eventual hardens, from ambient light, you’ll get the pattern you see in your image. If you see this while washing out, it’s a good indicator to keep on working on the area with water, and maybe your finger. If it is slimy to the touch, then you are feeling unexposed emulsion – so keep washing.