No need to "close the Mat". Such defects are perfectly cleaned normal restorer in hospital (rinsing - it short; how long will it take to drying under pressure - it is impossible to say in advance). Another thing is that it will probably cost You more than the cost of the prints. But to call and find out (for example - to the restoration of the graphics of any art Museum, but if You are in Moscow in the division rest. schedules GRC) is worth nothing. For the demand, as we know, normal people do not take money...
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