Saturday, October 21, 2006 - 2:40 PM
Salon C ( Houston Westchase Marriott Hotel)
736

Precise color definitions in the chemistry laboratory

Darren L. Williams, Thomas J. Flaherty, Casie L. Jupe, Stephanie A. Coleman, Kara A. Marquez, and Jamie J. Stanton. Sam Houston State University, Huntsville, TX

The year 2006 marked the 75th anniversary of the Standard Colorimetric Observer published by the Commission Internationale de l'Éclairage (CIE). The CIE standard has formed the basis of modern colorimetry providing an objective benchmark for color specification that is vital to the textile, paint-pigment, and digital-imaging communities. Given this legacy, it is unusual that the systematic definitions of color are absent from most chemistry curricula. This presentation will assist the chemical educator who wishes to connect the visible spectrum obtained in the chemical laboratory to the standard RGB values used by digital imaging equipment. The spreadsheet-based data analysis involves many steps that expose the student to normalized numerical integration, matrix transformation, color-space definitions, conditional equations, Boolean logic, and base-ten equivalents of binary numbers. The presenter will also outline the strengths and weaknesses of color prediction using widely-available molecular modeling programs.