Reflectance FTIR Spectra for the Characterization of Pigments

Pigments were sourced from the Forbes Pigment Collection at the Harvard Art Museums. Reflectance FTIR spectra of pigments painted on Indian paper with gum Arabic. Paint outs were prepared by Celia S. Chari. Reflectance FTIR spectra were collected at the Center for Nanoscale Systems in Harvard University by Celia S. Chari and Arthur A. McClelland.

For Specular: Spectra taken using a Nicolet iS50 FTIR with a Pike Technologies VeeMAX II specular reflection accessory set at 45 degree angle of incidence. An average of 16 scans were measured per spectra, with a resolution of 4 cm^{-1}, using a DTGS detector.

For Diffuse: Spectra taken using a Nicolet iS50 FTIR with a Pike Technologies Integrating sphere. An average of 16 scans were measured per spectra, with a resolution of 4 cm^{-1}, using a LN2 cooled MCT detector.

For LUMOS: Spectra taken using a Bruker LUMOS I FTIR microscope in reflection mode. An average of 16 scans were measured per spectra, with a resolution of 4 cm^{-1}, using a LN2 cooled MCT detector.

For MFA: Nicolet continuum FTIR microscope in reflection mode. 650 to 4000 cm-1. using a LN2 cooled MCT detector. 75 x 75 um^2. MCTA narrow band cuts off at about 650. 100 scans at a resolution of 4 cm^{-1}.