Acid-free paper Acid-free paper Acid-free paper is paper that if infused in water yields a neutral or basic pH (7 or slightly greater). It can be made from any cellulose fiber as long as the active acid pulp is eliminated during processing. It is also lignin- and sulfur-free. Acid-free paper addresses the problem of preserving documents and artwork for long periods. Paper made from wood-based pulp that has not had its lignin removed turns yellow, becomes brittle, and deteriorates over time. When exposed to light and/or heat, the molecules in the acidic paper will break down even faster. Acidic wood-pulp paper became
Alkali Act 1863 Alkali Act 1863 Under the British Alkali Act 1863, an alkali inspector and four subinspectors were appointed to curb discharge into the air of muriatic acid gas (gaseous hydrochloric acid) from Leblanc alkali works. In 1874, under the Alkali Act 1874, the Inspector became the Chief Inspector. The first Chief Inspector was Dr Robert Angus Smith, he was statutorily responsible for the standards set and maintained by the Inspectorate, and reported directly to the Permanent Secretary of his department. For the first sixty years of its existence, the Inspectorate was solely concerned with the heavy chemicals industry, but from the