| Abstract: | CONCLUSION. Due to differences in type of soiling and type of paper itself, universal conditions for laser cleaning can not be put forward. The research results obtained with an exaggerated model (high surface density of charcoal soiling, highly sensitive cellulosic material), indicate that laser cleaning of paper may result in its increased instability. However, it should be stressed that even if optimal laser cleaning conditions are achievable, with minimal yellowing, the ccllulosic substrate will still be destabilized in the long-term, both during thermal and photo ageing. It is doubtful whether large-area applications are thus acceptable, while laser cleaning of localised areas may still be the cleaning method of choice in certain instances (low mechanical stability, hindered access, unavailability of other treatments). Furthermore, since paper is a complex material, the behaviour of a particular artefact during laser cleaning is difficult to predict, and testing before use is essential. |
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