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Paper is an extraordinary example of a composite engineering material with practical use in a huge variety of applications. Since its invention in China, there have been many alterations to manufacturing techniques, component formulation, and surface finishing, yet the essential characteristics of paper have not changed greatly. The objective of this experiment is to demonstrate that the chromatographic performance of paper as a stationary phase may be used to distinguish between externally similar materials. The procedure developed is so simple that even students with little exposure to practical chemistry and limited chemical knowledge can understand the essential content. Because of the ubiquitous nature of paper, it is often recovered from crime scenes as evidence for analysis. However, the variety of sources and the mechanical or chemical properties often make demonstration of unequivocal correlation between "questioned" and "known" or "reference" samples a complex task. Introducing the practical session as a crime scene investigation, and presenting the laboratory exercise as an accessible forensic technique for paper identification, adds an exciting dimension to the practical experience for young people. The authors' application of this strategy has been successfully extended as it has become evident that the experiment motivates a surprisingly wide range of audiences. [ABSTRACT FROM AUTHOR]

Looks at the importance of the preservation of paper. Description of the chemical reactions of the aging of paper; Use of mass deacidification methods; Evaluation of the mass deacidification processes; Evaluation of seven mass deacidification methods; Recent developments; Conclusions.

The article focuses on an experiment for the analysis of microbial activity in topsoil. It is stated that topsoil is the topmost layer of soil, which contains large amounts of bacteria and other microorganisms, that make the soil rich in nutrients to be used by plants. The microorganisms include bacteria, viruses, fungi, algae, and protozoa. In the experiment, qualitative analysis of microbial activities in topsoil is done by using white copy paper and a handmade cadmium sulfide-light emitting diode (CdS-LED) reflection photometer. White paper sheets are dipped in a soil solution, and treated with iodine, which results in a blue color. The depth of the blue color is measured by using the handmade reflection photometer.

Examines the chemistry involved in carbonless copy paper. Illustration of the basis of carbonless paper; Details on experiments conducted on carbonless paper; Method used in the examination of the paper; Information on the principles of carbonless paper.

The article focuses on a suitable substitute for weighing paper used by students in chemical laboratories. It reports that a suitable substitute may be found in patty paper sheets, the slips of paper used to separate hamburger patties. The use of these sheets can cut the cost of weighing paper by about seventy-five percent. Students can obtain patty paper through their school's dining services. Furthermore, the article provides some useful website addresses for students where the can obtain patty papers.