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Despite clean dirty magnet for dishwasher vigorous cleaning action is Oslo's chalk-white marble-opera being yellow. The Italian rock that a violent CO2 emissions from traffic and Scandinavian temperatures a dangerous cocktail. By Birgitte Marfelt November 26, 2007 at. 14:53
Already in early summer discovered Statsbygg that the newly laid marble yellowing, both on the outside and inside clean dirty magnet for dishwasher the opera house. Project Manager Erling ES Magnusson clean dirty magnet for dishwasher admit to Aftenposten that the premature aging process is anything clean dirty magnet for dishwasher but sex.
The reason why this happens is not clear. The theory is that there is an undesirable reaction between the stone, oxygen clean dirty magnet for dishwasher and moisture. Research Sintef is already conducting investigations, as is the Italian company Campologghi that supplied marble clean dirty magnet for dishwasher for 56.8 million crowns from the quarry in Carrara.
When it was chosen stone to the opera building, clean dirty magnet for dishwasher flared up a heated debate. Petroleum and Energy Åslaug Haga spoke of using Norwegian stones in prestige building, while Sintef believed that granite was better clean dirty magnet for dishwasher suited. Geologists warned against the use of marble, but the architectural firm Snøhetta stood firm on his:
"A washing machine, which in a few few days running all over the opera with brushes and a pressure washer is enough to keep aldringsprosessen in marble in check," said Snøhetta's project manager, Tarald Lundevall, told Aftenposten. He was backed by Statsbygg in that little extra washing had to be tolerated, since the marble aged beautiful than other stones.
It is contrary to common sense to staining or weathering clean dirty magnet for dishwasher caused by CO2. It certainly seems to have overlooked that traffic Besides CO2 gives particles and NOX. The particles could give the color and NOX could form nitric acid (or -syrling), as given corrode the surface of carbonates.
In the title says indirectly that a violent CO2 emissions combined with Scandinavian temperatures have caused to the white marble has become yellow. Similar to the rubbish must hunt long after. The mere fact that the marble can also become discolored indoor excludes well the Scandinavian climate, which contributed to the problem.
It should be mentioned that such yellow discoloration especially if Carrara marble, as used here, is not an alien phenomenon on the marble floors. The explanation is that small amounts of iron compounds (typically pyrite FeS2), finely divided in the rock is oxidized by strongly basic compounds (porevæske) from the concrete or mortar. Therefore, stains happen, both indoor and outdoor, only the stone is exposed to an alkaline liquid. Usually it lægningsmørtelen that "deliver" basic porevæske to the stone, but alkaline influences may also come from strong alkaline cleaners. As such discoloration often sit down in the stone (marble is usually very transparent), then such stains are very difficult to remove.
We know by experience that it is often only a small fraction of all stone slabs that have this unfortunate composition that may cause discoloration - but this is of course clean dirty magnet for dishwasher particularly unfortunate when there is a showplace as Oslo Opera.
I do think that the debate runs completely off track. You should see it in the light of the fierce debate in Norway about using Norwegian stone materials for opera - and not a "cheap" Southern European marble.
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