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The reactants colour will be differnate so when they react 2 each other mostly the will change 
 so by seeing we can identify that is a a change in colour 
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arre u dont understand my thing
by seeing it is nt the answer
firstly tell me one complete explanation of this question
If the substance is reactive and changes its color ....... note the color first after  the 2 substance finish reacting we see the color is different from the color we noted 
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