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2. Paper chemicals - Wikipedia

   en.wikipedia.org/wiki/Paper_chemicals

   Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from sulfite ...

3. Sulfite - Wikipedia

   en.wikipedia.org/wiki/Sulfite

   A space-filling model of the sulfite anion. Sulfites or sulphites are compounds that contain the sulfite ion (systematic name: sulfate(IV) ion), SO 2− 3. The sulfite ion is the conjugate base of bisulfite. Although its acid (sulfurous acid) is elusive, [1] its salts are widely used.

4. Sulfite process - Wikipedia

   en.wikipedia.org/wiki/Sulfite_process

   The first sulphite mill in the United States was the Richmond Paper Company in Rumford, Rhode Island in the mid-1880s. The invention of the recovery boiler by G. H. Tomlinson in the early 1930s [2] allowed kraft mills to recycle almost all of their pulping chemicals.

5. Acid-free paper - Wikipedia

   en.wikipedia.org/wiki/Acid-free_paper

   The company Hercules Incorporated developed the first alkaline sizing in the 1950s that made acid-free paper possible. [10] Despite the advances in paper making and the identification of and concern around the brittle book problem, it took decades before the adoption of ANSI NISO Standard Z39.48-1984 - Permanence of Paper for Publications and Documents in Libraries in 1984.

6. Paper - Wikipedia

   en.wikipedia.org/wiki/Paper

   Paper is a thin sheet material produced by mechanically or chemically ... the sulfite process dates back to the 1840s and was the dominant ... drawing paper , pastels ...

7. Tracing paper - Wikipedia

   en.wikipedia.org/wiki/Tracing_paper

   Tracing paper is paper made to have low opacity, allowing light to pass through.It is named as such for its ability for an image to be traced onto it. The modern version of tracing paper was developed for architects and design engineers to create drawings which could be copied precisely using the diazo copy process.