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A damp stain or a mould mark (actually always majority) on paper (in books) and textile (laundry) by mold fungi and is a typical sign of aging is formed. The mold fungus pores are spread by air and are over years or decades survivable, the relative air humidity needed for their Vermehrung are somewhat more than 55%.
Damp stains to wallpapers or also at the cover (see Abb.1) to point on badly ventilated areas or, if only locally available, on isolation and cold bridges lacking in the wall or at the cover.
To damp stains in books leave themselves only by a specialist - whom paper or book restorer removes, just as also with pressure diagram and geographical maps. For wallpapers there are various special means on the market, most is based on Chlorbleiche and is therefore only with caution in dwellings to be used. Mould marks in the laundry it are very persistent and can likewise earliest with Javelwasser be eliminated - if textiles are still so far durable that they get over this Rosskur are able. The UV light portions of the sun remove for damp stains likewise relatively effectively and pollution free. These bleaching processes are possible however only with bright or white materials.
To prevent leave themselves to damp stains by the lowering of the relative air humidity under 50%, also by reduction in temperature under 8"°C, partly also by precise cleanliness and by laying on - not straight problem-free - fungicides.
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