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(A) Control plate inoculated with isolate klmp33 producing blue pigment in basic condition. (B) The pigment remains the same when the test organism is a non-acid producer (Aspergillus flavus MTCC 277). (C) The pigment changes from blue to red when the test organism is an acid producer (Aspergillus niger MTCC 281). (For interpretation of color in this figure, the reader is referred to the web version of this article).
