Determine the infrared absorption spectrum of Microcrystalline Cellulose as directed in the ATR method under Infrared Spectrophotometry , and compare the spectrum with the spectrum of Microcrystalline Cellulose RS for Identification: both spectra exhibit similar intensities of absorption at the same wave numbers. If there are absorptions between 800 cm-1 and 825 cm-1, and between 950 cm-1 and 1000 cm-1, disregard the absorptions.