As well as generalised fogging caused by exposure of the whole film to light, there are other ways that light can affect a film when an automatic processor is used.
What processing error has caused this pattern of light and dark?
Automatic developers have a "dark box" with hand holes in the side. The film is unwrapped in the dark box.
If light can enter the box through the wrist-holes, this pattern commonly emerges. Dark areas appear where light reaches the film. Normal areas are where the fingers and thumbs were holding the film during unwrapping, protecting it from the light.
When the person has thin wrists that do not completely fill the hand-holes. If this happens, the holes should be modified or replaced with smaller ones.
What processing error has caused this pattern of light and dark?
The problem here is that the hands were removed from the box too early. The film had not totally left the dark box and entered the developing compartment - there was still a little bit poking out of the rollers.
When the hands were removed, light entered the box through the hand holes and exposed that little bit.
You can see from the pattern that the film had not been fed exactly straight into the rollers.
With enhanced CPD Certificates. Dentaljuce is brought to you by the award winning Masters team from the School of Dentistry, University of Birmingham, UK. All have won awards for web based learning and teaching and are recognised as leaders and innovators in this field, as well as being highly experienced clinical teachers. Full access to over 100 courses, no extras to pay.
Student Membership
No Certificates. With universities cutting down on traditional lectures, many students are currently having to rely more on online resources. If you don't need CPD Certificates, we are offering an amazing discount on your Dentaljuce personal membership fee. Special student price just £29 for 12 months individual membership.