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<\/p>\nWe always say that water is wood's worst enemy. When it is in excess it creates conditions for the growth of micro-organisms that feed on the wood, causing it to rot. And yet, there are logs that have been immersed in water for a long time and are still in very good condition. Such logs taken from the lake or swamps can be used without problems to make furniture or other objects. Not really without problems, because sometimes the wood is so hard that it can jeopardize the integrity of tools. Find out how submerged wood is preserved in water and how it becomes harder or resonates more pleasantly below.<\/p>\n
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Because there is no air. Wood rot<\/a> is caused by specific fungi that feed on the components of wood - cellulose, hemicellulose and lignin. This causes important changes in structure and properties. However, a suitable environment is needed for the fungi to develop: water content in the wood above 20%, presence of oxygen, temperature in the range 0-40\u00b0C. As the wood is submerged in water, oxygen is at a very low level so the organisms responsible for decay cannot live.<\/p>\n This explains why logs that are not immediately cut and dried are sometimes stored in pools of water. Wood is a hygroscopic material with a high absorption capacity. It floats because there is air in the hollows inside, density of wood mass<\/a> compact being for all species about the same - 1500 kg\/m\u00b3. Gradually the air inside is replaced by water, the density increases and exceeds that of water and the trunk sinks. Species react differently, with denser species sinking faster.<\/p>\n Durability in water is also linked to the fact that lignin, which gives the wood its stiffness and strength, is very stable in an aqueous environment. Cellulose swells in the presence of water and, over time, can become food for various aquatic life. Hemicellulose is the least resistant. It dissolves in water under the action of salts which, under certain conditions, form dilute acids and gradually separate from the cellulose skeleton. Therefore, the higher the lignin content, the longer the wood resists submerged in water.<\/p>\n Below are the best known native species and their average durability fully immersed in water:<\/p>\n (source: J. Filipovici - Study of Wood)<\/p>\n Sometimes, wood that has been removed after hundreds of years from water or bog is very hard. One explanation for this hardness is the time when the tree grew. Hundreds of years ago, growth was much slower and forests were not intensively logged. Trees were felled at full maturity, when they were very tall and thick. The slow growth meant that the wood was very dense, with the annual rings close together. On the other hand, salts from the water penetrate the wood and take the place of hemicellulose. If it has been in the water for very long periods (thousands of years), the wood can even reach the hardness of stone (petrified wood).<\/a> The deposited salts do not spoil the design of the wood, and the processing produces slabs with the appearance of wood and the hardness of rock. Petrified wood is used to make jewelry, ashtrays or decorative objects.<\/p>\n There are companies all over the world working to recover wood that was washed up on the bottom of lakes, seas and oceans in the 18th and 19th centuries. This was the period when a lot of high-quality timber was transported from the colonies to Europe. In the USA, a lot of building was done due to emigration and timber was sometimes brought by water from the forests of Canada or Alaska. During transportation some rafts or ships sank. The wood that was not brought ashore ended up on the bottom of the water, stuck in the mud. With modern machinery, the wood is identified, recovered and sold to furniture manufacturers. They say the fiber is denser and more consistent, and the wood is often of higher quality than today's wood.<\/p>\nThe durability of wood submerged in water is not the same for all species<\/h5>\n
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Harder wood with denser and more consistent fiber<\/h5>\n
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<\/p>\nWood with better resonance than Stradivarius violins<\/h5>\n