"Hello,wondering if you could give me some advice,I have a few black and white postcards dated around 1900 to 1914,and when turning them to the light there is a silver "shine" visable,it really spoils the postcard,is there any way of treating this?Any idea what causes it?Best Regards Ty Burton"
Hi,
What you are seeing is metallic silver that has migrated to the surface of the print from the photographic emulsion. Probably caused by chemical contamination or poor washing when the photo was made, it can also be caused by oxidation or prolonged exposure to light over the decades. It's best left alone as removing it can significantly lighten the shadow areas of the image it resides in and ruin the photograph.
If you really MUST remove it, you could try using a modern plastic eraser carefully and evenly on the surface, perhaps trying a small inconspicuous patch first. Different types of paper will react in different ways to this treatment so you really do need to be careful, but it can come in useful if you need to recover the detail so the image can be reproduced (scanned or copied) for example. In most cases the silvering does not affect the value of the postcard so it is better to leave it alone. regards Mike Day
- I've found it necessary to clean the silvering on cards on the odd occasion when retrieving the missing image detail is of much more importance than the actual value of the postcard. This can be done effectively but is VERY risky with the method described above and you can often be actually rubbing away the image.... and it's too late by the time you've realised!!
Labels: damage, FAQ, technical