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  Indian J Med Microbiol
 

Figure 1: The control (purple) and test (brownish black) biological indicators. (A) Test biological indicator (right side) demonstrating the change in color of the autoclave tape from light navy blue to brownish black. (B) Test biological indicator (right side) demonstrating the change in color of thermoplastic culture tube from purple to light brown

Figure 1: The control (purple) and test (brownish black) biological indicators. (A) Test biological indicator (right side) demonstrating the change in color of the autoclave tape from light navy blue to brownish black. (B) Test biological indicator (right side) demonstrating the change in color of thermoplastic culture tube from purple to light brown