| Problems |
Causes |
Remedies |
| Weak Image |
Ammonia used is of low
concentrate
Insufficient development time
Excessive exposure time
Expired film stock
Film exposed for long periods prior to
use |
Increase the ammonia concentration
for development
Increase the development time
Reduced the exposure time
Use fresh stock, please check the expiry date on the roll
Ensure that the fresh film is not allowed to remain exposed for more than 15 minutes under 300 lux conditions
|
| Non-Image area not fully transparent (i.e. background staining) |
Insufficient exposure time
Expired film stock
Film exposed to hostile atmosphere
(e.g. Ammonia vapour) during
storage and thereby pre–developed
|
Increase exposure time
Use fresh stock, please check the expiry date on the roll
Ensure proper storage conditions
Discard damaged stock
|
| Loss of highlights, dots or fine lines |
Excessive exposure time
Insufficient vacuum in contact frame
during exposure |
Reduce exposure time
Ensure perfect vacuum |
| Images turns violet on airing after development (instead of deepening) |
Insufficient development
|
Increase development time
|
| Background developing stains during storage |
Ammonia vapours trapped in the
stack due to insufficient airing after processing prior to packing
|
Allow airing after processing for at least 30 minutes in a warm well ventilated room
|
| Film edges and tape marks do not get burnt away during exposure |
Insufficient exposure or inadequate vacuum or air pocket in vacuum frame |
Increase exposure time to maximum possible without dot loss and ensure perfect vacuum
|
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