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  1. 1 Ochrona Zabytków

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  1. 1 Kehl J.

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  1. 1 1981

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Kehl J.
Ochrona Zabytków
|
1981
|
issue 1-2
98-99
EN
On old maps in verdigris painted places there occur now crumbling and falling-off stains difficult to remove with usual agents. Some ligands, forming soluble chelates in combination with copper, were examined. The examinations made allowed us to choose the bath in 1% water solution o f sulfosalicylic acid or 1% solution o f disodium EDTA salt to remove the stains.
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