A method for determining not to reuse a previously used and cleaned reaction cuvette in an analyzer when an assay scheduled to be performed may be adversely affected by contaminants remaining in the cleaned reaction cuvette. Also provided herein are vectors and host cells comprisig those nucleic acid sequence, chimeric polypeptide molecules comprising the polypeptides of the present invention fused to heterologous polypeptide sequences, antibodies which bind to the polypeptides of the present invention and to methods for producing the polypeptide of the present invention. The absorption layer has absorbency in visible and infrared regions, and the gel-like material is a substance which has a gel dissolution temperature of 100 degree C.