Over time, tobacco smoke residue buildup containing nicotine and other harmful chemicals can ruin valuable paintings and photographs. The ugly, yellowish-brown sticky film would coat any surface, making photographs lose their original appearance and destroying the photo emulation layer.
As with most restoration projects, the process begins with making a high-resolution scan of a photograph to record the condition that the item was in prior to cleaning and to assure that if cleaning fails to restore the image to its original color and condition, digital restoration techniques can be employed. Next, per restoration and best practice guidelines, a small area is selected for testing a number of cleaning solutions to determine which one can be safely used without the possibility of causing additional damage to the item.
Once all the preparations are made, the restoration process begins with the careful application of a specially formulated cleaning solution, followed by hours of painstaking removal of the loosened grime to restore the original colors. Since the oil or tempera paint used to add color to black and white photos may react differently to cleaning solutions than the photo emulation, extra care and precautions are necessary while handling colorized photographs.
With the cleaning process completed and any additional treatments performed, a photograph is placed into an archival folio storage box or mounted and framed to protect it from the possibility of further damage and deterioration.