Possible explanation of the phenomenon was ascribed to variations or slow drift found in the readings of the spectrophotometer (Shazman et al., 2007). There was no consistent pattern in these results; e.g. sometimes the microwave heating seems to produce slightly higher readings and sometimes vice versa. Since the drift could not be accounted for quantitatively, another test was conducted where the solutions were heated at temperatures of 91 and 92◦C in a water bath (Fig. 2B). Here too, the results suggest differences between microwave heating at 90◦C and water bath heating at 90, 91 and 92◦C.