Indicators in the nature of pure chemical substances made in the form of synthetic compounds that react to the presence of enzymes, acids, bases, reducing agents, oxidizing agents or electromagnetic irradiation by turning colors or emitting light

'acid':23 'agent':26,28 'base':24 'chemic':7 'color':34 'compound':15 'electromagnet':30 'emit':36 'enzym':22 'form':12 'indic':1 'irradi':31 'light':37 'made':9 'natur':4 'oxid':27 'presenc':20 'pure':6 'react':17 'reduc':25 'substanc':8 'synthet':14 'turn':33

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