Searched for: subject%3A%22Black%255C%2Bweathering%22
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TNO Bouw (author), Nijland, T.G. (author), Dubelaar, C.W. (author), van Hees, R.P.J. (author), van der Linden, T.J.M. (author)
Black weathering of sandstone in monuments is widespread. Some obiects owe their name to it, like the Porta Nigra in Triet (Germany). Other than the black gypsum crusts common on limestone, the black weathering layer on sandstone is rather thin and well adhe¬°ent. Formation of such layers on Bentheim and Obernkirchen sandstone, both widely used...
article 2003
document
TNO Bouw (author), Nijland, T.G. (author), Wijffels, T.J. (author)
Decisions about the cleaning of natural stone should always be made within the awareness of direct and indirect damage that may be the result of cleaning. During the last decade, laser cleaning of objects and monuments of natural stone has become increasingly popular. Whereas a considerable amount of literature has been devoted to the effect of...
article 2003