Differentiation of black gel inks using optical and chemical techniques

Gel ink pens have become a common writing instrument in the United States. Questioned document examiners often attempt to optically differentiate gel inks from each other and from other non-ballpoint ink writings (e.g., those from roller-ball pens). Since early formulations were primarily pigment-based, they do not elute when analyzed by thin-layer chromatography. However, recent gel ink formulations (i.e., within the past five years) include dye-based inks that can be easily separated. This study differentiates black gel inks using optical and chemical techniques. The techniques include: microscopy, visible and near infrared reflectance, near infrared luminescence, thin-layer chromatography (TLC), spot tests, and gas chromatography/mass spectrometry (GC/MS). As a result of this study a flow chart has been developed allowing for a systematic determination of a questioned ink. In addition, an analysis of volatile compounds found in gel inks revealed that there are some unique ingredients that may be found in gel inks that are not typically found in other non-ballpoint inks.     

The forensic analysis of thermal transfer printing

Thermal transfer printing refers to printing processes that utilize heat to produce an image by either physical or chemical means or by a combination of both. As the technology has improved and the supplies have become less expensive, the use of thermal printing in the personal and business markets has increased significantly. Specifically, dye diffusion thermal transfer and thermal mass transfer have become predominant in the production of counterfeit credit cards, drivers' licenses, and other types of documents produced on plastic media. Chemical analysis by means of thin layer chromatography (TLC) has proven to be useful in characterizing various types of inks (e.g., writing and inkjet inks). In this study, the authors examined 81 different samples that included a total of 54 printer samples (43 photographic prints on paper and eleven plastic card samples) and 27 printer ribbons. A new TLC method was developed and tested utilizing a solvent system (80% n-hexane, 3% methyl ethyl ketone, and 17% ethyl acetate) that is capable of producing excellent resolution.     

The Politics of Crisis Management: Public Leadership Under Pressure by Arjen Boin,Paul 't Hart,Eric Stern,and Bengt Sundelius

ABSTRACT

The article addresses two principal questions: how public management reforms develop in a context of high government turnover, and how, under these circumstances, features of the specific area of public management policy affect the dynamics of the reform and in particular its “technical feasibility.” The research questions are addressed through the case study of the Italian administrative context between 1992 and 2007, a period marked by tumultuous government turnovers. The article presents reforms in two policy areas of public management: civil service reform and innovation, over a three-period time span covering 15 years. The brief duration of political leadership represents a threat to the approval and implementation of policy interventions irrespective of the political salience of the issue and the need for legal enactment. Therefore, the success of a public management reform process in an unstable political context characterized by frequent government turnovers depends on meeting certain conditions for successful policy entrepreneurship: the a priori expertise of policy entrepreneurs, their ability to repackage the issue, keep a community of practice alive, and maneuver the dynamics of the legal process. However, implementation, being a less visible phase, suffers from greater discontinuity as “maintenance activities” necessary for the success of reform are disregarded. Thus, the consideration of the temporal dimension of the policy cycle and the area-specific effects on public management reform dynamics exerted by diverse levels of political salience and legal enactment represent the main contributions of this work to the theories on public management policy change.     

Airport Security, High Reliability, and the Problem of Rationality

The events of September 11, 2001, have raised troubling questions regarding the reliability and security of American commercial air travel. This article applies the concepts and logic of high–reliability organizations to airport security operations. Contemporary decision theory is built on the logic of limited or buffered rationability and is based on the study of error–tolerant organizations. The concept of high–reliability organizations is based on the study of nearly error–free operations. For commercial air travel to be highly secure, there must be very high levels of technical competence and sustained performance; regular training; structure redundancy; collegial, decentralized authority patterns; processes that reward error discovery and correction; adequate and reliable funding; high mission valence; reliable and timely information; and protection from external interference in operations. These concepts are used to inform early–stage issues being faced by both local airports and the newly established Transportation Security Administration.     

The use of filtered light for the evaluation of writing inks analyzed using thin layer chromatography

Thin layer chromatography (TLC) is a scientific methodology that can be used to compare and characterize ink formulations. Occasionally, when evaluating chromatographic profiles on a TLC plate with ambient light, different ink formulations, or the same inks from different batches, may appear indistinguishable. The use of filtered light can be very effective to illuminate characteristics that are not readily apparent with ambient light. There are a diverse number of components commonly found in writing inks, and it may be that some of them respond to particular wavelengths of energy that are not visible to the unaided eye (i.e., colorless). There has been very little information published that addresses the use of filtered light for evaluating TLC plates. Twenty-nine ballpoint writing ink samples were selected for TLC analysis. Further evaluation using an alternate light source, coupled with the appropriate filter, proved to be an effective means for definitive discrimination in some cases.     

The identification of 2-phenoxyethanol in ballpoint inks using gas chromatography/mass spectrometry--relevance to ink dating

Developing and implementing a generally accepted procedure for the dating of ink found on documents using dynamic approaches has been a very formidable undertaking by forensic document examiners. 2-Phenoxyethanol (PE), a common volatile organic compound found in ballpoint inks, has been recognized for over a decade as a solvent that evaporates as ink ages. More recently, investigations have focused on the solvent loss ratio of PE prior to and after heating. To determine how often PE occurs in ink formulations, the authors analyzed 633 ballpoint inks utilizing a gas chromatograph/mass spectrometer. 2-Phenoxyethanol was identified in 85% (237/279) and 83% (293/354) of black and blue inks, respectively.     

The use of an electrostatic detection device to identify individual and class characteristics on documents produced by printers and copiers--a preliminary study

The market is inundated with inkjet printers, laser printers, and photocopiers, which are often used in criminal activities. Many of these office machines are built by various manufacturers, hence they are constructed with different hardware designs (e.g. "rolling" and "grabbing" mechanisms) that have changed over the years due to technological advances. Examinations of printed documents that involve the chemical analysis of ink colorants and the identification of physical machine defects such as trash marks are essential for the forensic examiner, but new techniques are needed to more closely identify a machine model or group of models. An electrostatic detection device (EDD) provide forensic examiners with a nondestructive method to examine indentations on a document. In this work, an EDD is used to detect latent physical markings left on documents by printers and photocopiers. Seventeen inkjet printers, 12 laser printers, and 3 photocopy machines were used to produce test documents. Physical markings were detectable in the large majority of the documents and were reproducible 100% of the time.     

Modernization from above versus reform from below: U.S. policy toward Latin American agricultural development

This article distinguishes two tendencies in United States policy towards Latin American agriculture: a redistributionist tendency, favouring the break‐up of large private estates into small peasant plots; and a productionist tendency, favouring technical efficiency on existing holdings as the key to successful development. It is shown that this latter tendency has come increasingly to prevail in U.S. Government circles over the past decade, a shift in policy which is assumed to reflect political as well as strictly economic considerations. The endorsement of land reform, at least on the level of declared policy, in the early years of the Kennedy administration, has been followed by a reappraisal which brings U.S. policy more in line with the preferences of the large landowners who are among the most reliable political allies of the United States. (Ed.)