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Acid-free paper is paper that has a neutral or basic pH (7 or slightly greater). It addresses the problem of preserving documents for long periods. Paper made from wood-based pulp that has not had its lignin removed goes yellow and deteriorates over time. When exposed to light and/or heat, the molecules in the acidic paper will break down even faster. It was only in the 1930s that the effects of wood-pulp paper became known, when William Barrow (a librarian) published a report about the deterioration of acidic paper in the libraries. For fear of the gradual disintegration of written materials, measures have been taken to improve the quality of paper.
During production, acid-free paper may be treated with a mild base (usually calcium or magnesium bicarbonate) to neutralize the natural acids occurring in wood pulp, and it may also be buffered to prevent the formation of additional acids (as may develop from the application of sizing).
The bicarbonate is added in excess, to supply the paper with an alkaline reserve to provide protection from further attack by acids remaining in the paper or supplied by the environment (e.g. atmospheric sulfur dioxide).[1] The bicarbonate during drying loses carbon dioxide and water and is converted to calcium carbonate or magnesium carbonate. In order for paper to last at least 100 years it must have an alkaline reserve of 2% or more.
Today, much of the commercially produced paper is acid-free, but this is largely the result of a shift from china clay to (cheaper) chalk as the main filler material in the pulp: chalk reacts with acids, and therefore requires the pulp to be chemically neutral or alkaline. The sizing additives mixed into the pulp and/or applied to the surface of the paper must also be acid-free.
Alkaline paper has a life expectancy of over 1,000 years for the best paper and 500 years for average grades. The making of alkaline paper has several other advantages in addition to the preservation benefits afforded to the publications and documents printed on it. Because there are fewer corrosive chemicals used in making alkaline paper, the process is much easier on the machinery, reducing downtime and maintenance, and extending the machinery's useful life. The process is also significantly more environmentally friendly. Waste water and byproducts of the papermaking process can be recycled; energy can be saved in the drying and refining process; and alkaline paper can be more easily recycled.
What else can I help you with?
Is a Bristol paper the same as a sulfite paper?
No, far from it. Bristol paper is a lower quality grade of paper as well as having a different purpose. Bristol paper is a heavy paper and is usually made by layering or laminating papers together to the desired thickness. It takes its name from Bristol, England where this paper was first made, originally from rags. Sulfite paper is made from sulfite wood pulp. The pulp is pressed and bleached with chemicals until brilliant white. Because of this, sulfite paper is perfect for use as photographic paper as well as glossy brochures, books and other projects where reproducing images is important. The sulfite paper is able to render color and clarity extremely well thanks to its chemical treatment when being made.
What is the correct compound for Ag2SO3?
The correct compound for Ag2SO3 is silver sulfite.
What is the name of Fe2SO33?
Iron (III) sulfite
What is chemical symbol for sulfite ion?
The sulfite ion is SO32- It is not to be confused with sulfate, SO42-
What colour is red litmus in pH scale?
Blue litmus paper will turn to red because hydrochloric is an acid. In aqueous solutions,acid change blue litmus paper to red. In aqueous solutions,base change red litmus paper to blue.
Is sodium sulfite an acid?
Sodium sulfite (NaSO3) is a salt of the sulfurous acid.
Is rosin paper acid free?
Rosin paper is not inherently acid free. It is typically made from recycled paper that may contain some acidity. If acid-free paper is required for a specific application, it is advisable to use paper specifically labeled as acid free.
If you are using paper that is NOT acid free will your photos be safe if you FIRST mount them on acid free paper?
Not necessarily. Acid can migrate through the acid free matting. If you use buffered paper to mat, that may help neutralize the acid migration. There are also buffering sprays you can use on acidulous paper.
Is Asian paper acid free?
That depends on the specific type and brand of Asian paper. Some Asian papers are acid-free, while others may contain acid which can cause deterioration over time. It's best to check the specifications of the paper or consult with the manufacturer to determine if it is acid-free.
Is sulfur dioxide a sulfite?
No, sulfur dioxide (SO2) is not the same as a sulfite. Sulfur dioxide is a gas while sulfite is a chemical compound that contains the sulfite ion (SO3^2-). Sulfur dioxide can react with water to form sulfite ions.
What is the conjugate acid of HSO4 sulfate or sulfuric acid or sulfite or sulfurous acid?
Sulfuric acid.
Is a Bristol paper the same as a sulfite paper?
No, far from it. Bristol paper is a lower quality grade of paper as well as having a different purpose. Bristol paper is a heavy paper and is usually made by layering or laminating papers together to the desired thickness. It takes its name from Bristol, England where this paper was first made, originally from rags. Sulfite paper is made from sulfite wood pulp. The pulp is pressed and bleached with chemicals until brilliant white. Because of this, sulfite paper is perfect for use as photographic paper as well as glossy brochures, books and other projects where reproducing images is important. The sulfite paper is able to render color and clarity extremely well thanks to its chemical treatment when being made.
Is sugar paper acid free?
No, paper made from sugar cane normally is not acid free. The fibers from sugar cane stalks are rather difficult to pulp, so paper mills normally use acid to digest them. Acid free paper normally come from "softer" fibers, such as hemp, kenaf and others.
What are names of the anions in sulfurous acid and chlorous acid?
Sulfurous acid: sulfite, (SO3)-2 Chlorous acid: chlorite, (ClO2)-
Is it ok to use wall paper in a scrapbook?
Wall paper should be okay to use in a scrapbook so long as it is acid and lignen free. If you do not know if your wall paper is acid and lignen free, there is a pen that can be marked onto the paper to read the acid and lignen levels. See the Related Links below for more information about the pH pen. It is important that your paper is acid and lignen free because if it is not, it can ruin your photos and layouts. Always be sure to purchase paper, or test any paper that you're not sure of, for acid and lignen. Most packaging will tell you if it is acid and lignen free.
What is the charge for Sulfurous acid?
Sulfurous acid (H2SO3) is a weak acid and can form sulfite salts. In its pure form, sulfurous acid does not exist as a stable compound. Rather, it is typically found in solution as a mixture of sulfite ions (SO3^2-) and bisulfite ions (HSO3^-).
What is the best glue for paper that ensures a wrinkle-free finish?
The best glue for paper that ensures a wrinkle-free finish is a high-quality, acid-free adhesive specifically designed for paper crafts.
