McCrone Associates

Ward Scientific Company (16) sells mineral specimens including asbestos. The National Institute of Environmental Health Sciences, (NIEHS) (17) supplies asbestos materials that have been characterized. UnTo n Internationale Contre Cancer (UICC) asbestos materials, often used in cancer research, are obtainable in laboratory quantity from Walter C. McCrone Associates, Inc. (18). 

In 1956 McCrone founded McCrone Associates, a private analytical laboratory in which the principal analytical technique employed was polarized light spectroscopy. Over the years he and his staff learned to visually identify over 30000 particles (McLafferty 1990). McCrone Associates speciahzed in the identification of polymorphs, asbestos samples, airborne impurities, among others. McCrone recently endowed a chair of chemical microscopy to Cornell University, his Alma Mater. 

Kofier, L. and Kofier, A. (1954). Thermo-mikro-methoden zur Kennzeichnung organ-ischer Stoffe und stoffgemiche. (Thermomicromethods for the study of organic compounds and their mixtures). Innsbruck, Wagner. A 1980 translation of this book by Walter C. McCrone is available from McCrone Associates, Inc. [8, 15, 95, 98, 240]... 

Obtained from McCrone Associates. Inc.. 2820 S. Michigan Ave.. Chicago, IL 60616. 

Exploratory bench-scale experimental studies were undertaken by Walter C. McCrone Associates, Chicago, 111., primarily to demonstrate (a) that Reaction 1 can produce a gas containing H2S at a concentration... 

Marvin A. Salzenstein directed the experimental studies performed by Walter C. McCrone Associates. He was assisted by Jan Markussen, now of Copenhagen, Denmark. 

The map was largely believed to be authentic until 1974, when the Yale Library hired a surface analysis group (McCrone Associates) to make a detailed examination. 

In their comprehensive investigation of the map. McCrone Associates made a careful preliminary examination using optical micros(x>py. These observations revealed that the drawing consisted of an apparently hand-drawn map with a black ink outline on vellum. The outline is bordered with an underlying pale yellow layer, which is typical of ancient manuscripts. A key early observation was that the black outline was not in perfect registration with the yellow underlayer. 

W.C. McCrone and J.G. Delly, McCrone Atlas of Microscopic Particles, and an online database (McCrone Associates, Inc., 2005). www.mccro-neatlas.com... 

FAST NEUTRON ACTIVATION ANALYSIS—John W. McKIveen SOLAR HEATING AND COOLING OF BUILDINGS—Richard S. Greeley ENVIRONMENTAL HEALTH CHEMISTRY—James D. McKinney ASBESTOS PARTICLE ATLAS—Walter C. McCrone CONTAMINANTS AND SEDIMENTS—Vol. 1 2—Robert A. Baker METHANE GENERATION RECOVERY FROM LANDFILLS—EMCON Associates... 

In spite of the great interest in the phenomenon of polymorphism and of the increased research activity beyond the boundaries of organic solid-state chemistry, it is a fact that only a few molecular compounds possess several crystalline forms, whereas for many other tens of thousands of molecular compounds only one crystalline form is known. In other words, why are there so few molecular crystals polymorphs The often quoted association between number of known forms and the time and energy spent in searching for them put forward by McCrone probably contains the answer to this question. It is probable that if thorough (combinatorial ) crystallization experiments were carried out on any given molecular species or molecular salt, alternative crystalline forms would be found. It is probable but not certain. 

Polarized light microscopy has long been used in chemical and mlneraloglcal studies, and was raised to a high level of applicability by Walter McCrone and associates, culminating in the extensive Particle Atlas(6), which included Innumerable glasses, organics and polymers. 

McCrone, W.C., Fusion Methods in Chemical Microscopy, Interscience Publishers, New York, 1957, pp. 1-5, available from McCrone Research Associates, Chicago, IL. 

Clarke G., Squibb Private Communication Clarke G., Squibb Private Communication Coy N.H. and Ochs Q., Squibb Private Communication McCrone Research Associates Ltd., Private Communication... 

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