Lynn Brostoff

Library of Congress | LOC · PRTD

This paper describes a novel multi-modal approach to the technical study of vessel glass based on a group of rare musical instruments: glass flutes and piccolos made by Claude Laurent and his workshop in Paris in the first half of the 19th century. Current condition issues that plague many of these instruments are characterized by a suite of comple...

This study explores the natural alteration of verdigris, both in the form of neutral verdigris (Cu(II) (CH 3 COO) 2 ⋅H 2 O) and basic verdigris (Cu(II) x (CH 3 COO) y (OH) z ⋅ n H 2 O), through combined Raman spectroscopy and X-ray diffraction investigation of samples created seven to eleven years prior to analysis. The naturally aged paint films o...

The Industrial Revolution led to mass production of many materials that naturally found their way into nineteenth century cultural heritage. One such material is flat glass, the manufacture of which underwent a succession of innovations that influenced the burgeoning field of photography. Results of historical research illustrate how changes in the...

This research investigates chemical alteration in the important historical pigment called verdigris, both in the form of neutral verdigris (Cu(II) (CH 3 COO) 2 . H 2 O) and basic verdigris (Cu(II) x (CH 3 COO) y (OH) z.n H 2 O), using reference pigment powders and historically relevant “mock-up” samples exposed to artificial aging. Analytical study...

Historical alkali silicate glass is prone to deterioration over time due to the uptake of atmospheric water and subsequent hydrolysis of the silicate matrix. Recent studies of historical glass have provided insight into the mechanism of alteration; however, few techniques can assess early onset glass alteration noninvasively. Herein, we present fib...

Use of Microscopy and Microanalysis in Assessing Kinetics of Degradation in 19th-century Heritage Glasses - Volume 24 Supplement - Andrew Buechele, Lynn Brostoff, Stephanie Zaleski, Nikolaus Deems, Elizabeth Montagnino, Isabelle Muller, Ian Pegg, Carol Lynn Ward-Bamford, Murray Loew, Xiaogang Xie

Synthetic, structural, spectroscopic and aging studies conclusively show that the main colorant of historical iron gall ink (IGI) is an amorphous form of Fe(III) gallate • x H2O (x = ~1.5 - 3.2). Comparisons between experimental samples and historical documents, including an 18th century hand-written manuscript by George Washington, by IR and Raman...

div class="title">A Study of Glass Composition and Crizzling in Two Claude Laurent Glass Flutes from the Library of Congress - Volume 21 Issue S3 - Andrew Buechele, Lynn Brostoff, Isabelle Muller, Carol Lynn Ward-Bamford, Xiaogang Xie

The primary goal of conservators of cultural heritage collections is to preserve. Conservation treatment of collection items is often an essential means toward that end. As conservators and cultural heritage scientists are well aware, interventions that are designed to alter phys. and chem. properties in order to enhance longevity and access may in...

This contribution presents results from the ongoing technical study of a rare fifteenth-century Armenian illuminated manuscript in the collection of the Library of Congress. Characterization of the manuscript components has been undertaken to create a preservation plan for the manuscript. Analytical results from the miniature of Mark allow identifi...

X-ray diffraction (XRD) complemented by Raman spectroscopy analyses of synthetic organic pigments in powder samples, layered paint systems, and commercial artists' paints bound in acrylic, alkyd, and oil media are presented. The potential and limitations of the techniques to identify and characterize mixtures of these pigments, along with inorganic...

X-ray fluorescence spectrometry XRF and micro-X-ray diffraction XRD were used to analyze the composition of pigments on a pastel drawing, Special No. 32, by Georgia O'Keeffe. XRF analyses showed that, among other pigments present in the drawing, the red, orange, and yellow pigments may possibly be identified with lead-and chromium-based pigments: l...

In this collaborative investigation, femtosecond laser ablation-inductively coupled mass spectrometry (LA-ICP-MS) was applied to the study of a remarkable group of ancient Chinese gold objects in the Smithsonian's Freer Gallery of Art and Arthur M. Sackler Gallery. Taking advantage of the superior ablation characteristics and high precision of a fe...

Plains Indian drawings and historical records produced in the nineteenth and early twentieth centuries made progressively greater use of nontraditional drawing materials such as commercial colored pencils, crayons, ink and watercolors. Similarly, cloth and paper begin to supplant traditional hide supports during this period. These non-traditional m...

Electrochemical impedance spectroscopy (EIS) is a technique that quantitatively measures the amount of corrosion protection provided by a coating to a metal substrate. This article illustrates the theory of EIS along with its potential for application in the evaluation of protective coatings for outdoor bronze sculpture and ornamentation. Three coa...

Copper-benzotriazole (CuBTA) film growth on rolled bronze was investigated by external reflection, also known as reflection-absorption infrared spectroscopy. Results confirm that the film growth in nearneutral conditions is dependent on time and concentration or solvent. New evidence was obtained for step-wise development of the Cu(I)BTA films. Ell...

Thesis (M.S.)--University of Cincinnati, 1995. Includes bibliographical references (leaves 75-77). Includes abstract.