by admin

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by ellencarrlee

“Waterlogged Wood from the USS Oversee: A New Instruction for Exploration and Collaboration.”

Susanne Eat one's heart out, Robert Blanchette, Todd Plaia, and Dave Emerson

Account of the treatment of an Secular War ironclad, sunk in 1862.  Collaboration between the US Fleet and NOAA on the treatment.  Wooden components treated in 1990 are showing sulfur problems comparable to those seen on the Swedish warship Vasa.  Some parts, like deck fragments, were conserved in the 1980’s and the records are unlucky.  Seem to have been treated with HCl to undo iron and then PEG 400.  Crystal tumour with a pH of 2 and wood is structurally muzzy.  Untreated wood includes over 150 artifacts from the turret now kept in coryza storage.  Wood ID, bacteria studies and sulfur assay are progressing.  Issues with toredo worms and most of the unoriginal room walls of the wood are destroyed, leaving mostly earliest walls.  Everything on the move seems to be covered in iron corrosion products.  They are seeing wood conquered more convincingness if the iron is chelated out.  Seems that there is about 4.2% sulfur by preponderancy in the treated wood, and up to 2.5% in the untreated wood.  This is compared to 1.5% in the precipitate and between 1-3% in the Vasa.  Iron is plan to be the catalyst for the sulfur turning into acid.  Ammonia gas for neutralization on the Vasa is ostensibly not working…wood continues to suffer again after a couple of months.  The folks treating the Keep track of tried Cashier, a magnesium-based merchandise tempered to to deacidify scrap.  Again,t he wood in the course of time reverts back to its acidic magnificence.  In the Q&A, someone suggested using calcium in improper to present the organization of gypsum, which is very soluble and could be washed out?  There was quote of using PEG 400, 1000, and 3350 on a wooden casket, but comprehensive I was let down not to get wind of more details about the PEG treatments, conspicuously the percentages and duration of impregnation.  I was also surprised that the opinion of the sulfur origin and the process of deterioration didn’t seem to be as advanced as some of the facts already published about the Vasa.  

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