Paper acid-free tissue

Why does the amount of acid in paper make such a difference Acids are corrosive chemicals. Corrosive chemicals can destroy material or living tissue on contact. Paper does not contain enough acid to burn skin, but over time the paper becomes stiff and brittle and eventually falls apart. As a result, precious personal memories or important historical documents that were written on acidic paper can be lost. Acid-containing paper can also transfer the acid to other objects in a process called acid migration. The acid can weaken or destroy the fibers in fabrics. It can also ruin photographs. Therefore, to preserve those irreplaceable memories, be sure to use paper that is acid-free. 

Smithsonian Center for Materials Research 8r Education. Acid free tissue paper for textiles 8r costumes. Available online. URL http //www.si.edu/MCI/english/learn more/taking care/ acidfree.html. Accessed on March 10, 2008. 

As a general rule, samples should be collected in decontaminated flasks and even those considered metal-free should be pre-washed. Glass recipients should be avoided. A good procedure for cleaning plastic containers is keeping them at least 24 h in a 10% (v/v) ethanolic nitric acid solution. Aqueous solutions do not leach out the aluminum well, because water does not wet plastic surfaces better contact occurs when an alcoholic solution is used. It can be seen that all alcoholic solutions were more efficient than the aqueous solutions. Table 10 shows the aluminum extracted from polyethylene by the action of some washing solutions. Just before use, the containers should be abundantly washed with ultrapure water. The best option is to use the flasks just after rinsing them, however if they must be dried, they should not be placed in an oven, even with the open side on tissue paper (paper contains aluminum). The best way is let them dry under a laminar flow. The proper heat and air movement inside the hood will help to rapidly dry the flasks. 

Considering the damage that clearly occurred in the past during long-term storage, it is obvious that museum fabrics should never be creased and folded. For costumes and other three dimensionally constructed objects, light weight, acid-free tissue paper should be crushed and stuffed wherever there is a crease. 

Curators, collectors, and conservators need to be on constant guard against acidic tissue paper that has discolored with age. Textiles stored with highly acid tissue papers also will become discolored with time. There are acid-free and alkaline-buffered tissue papers commercially available through archival paper and supply firms. In the last several years, paper companies have become aware of the needs of historic textiles and costume departments in museums, historical societies, and universities and are placing into production acid-free rolling tubes, tissue paper, and storage boxes for costumes and accessories. 

The cellulose is used in the fomi of tissue paper 2/1000 inch thick, 1 lb. to 100 of acid mixture. The nitro-cellulose produced by this formula is very insoluble in the compound ethers and other solvents of pyroxyhne, and is seemingly only converted or gelatinised by the action of the solvent. The next formula produces a mixture of tetra-and penta-nitro- celluloses hardly soluble in methyl-alcohol (free from acetone), but very soluble in anhydrous compoimd ethers, ketones, and aldehydes --... 

In compensation for this abnormal situation, fat is preferentially used as a sole energy source in the body. The metabolic shift to lipid utilization leads to hypertriglyceridemia accompanied by elevation of free fatty acid in blood and, in very advanced stages by elevation of ketone bodies including acetoacetate and 3-hydroxy-butyrate in blood. Increased level of CoA and acyl CoA in the diabetic rat liver was reported by Smith et al. [1]. This seems to be a metabolic response to increased utilization of fatty acid in diabetic state and suggests increased requirement for CoA in diabetic tissues. It is, therefore, interesting to study the effect of some precursors of CoA on diabetic hyperlipidemia. The present paper deals with a favorable effect of pantethine on lipid metabolism in streptozotocin diabetic rats. Pantethine treatment has been found to reduce increased levels of serum triglycerides,... 

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