As stated earlier, with 10mgml−1 of BPE, a purplish-pink color
was observed [as also seen in Fig. 1a (B) and b (A)]. Dark and
light ruby red colors were observed at a concentration of 1.0 or
2.0mgml−1. The reaction mixture turned dark reddish brown with
4mgml−1 and a pink color was developed with 5mgml−1 of the
BPE powder. Signature peaks indicative of nanoparticles were also
observed.