why is it essential that a coloured filter is used in a colormiter?

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the north
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fatlawrence5
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The coloured and filtered light is absorbed by the compound that is being tested- for a solution to appear a certain colour it must absorb the colours which are 'complimentary' to the colour it appears. The filter used in the colorimeter should be of a complementary colour so that it will be absorbed. Different concentrations of solutions will absorb different amounts of light, and this is how a colorimeter can help you to determine unknown concentrations of solutions. Hope this helps xx
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the north
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(Original post by fatlawrence5)
The coloured and filtered light is absorbed by the compound that is being tested- for a solution to appear a certain colour it must absorb the colours which are 'complimentary' to the colour it appears. The filter used in the colorimeter should be of a complementary colour so that it will be absorbed. Different concentrations of solutions will absorb different amounts of light, and this is how a colorimeter can help you to determine unknown concentrations of solutions. Hope this helps xx
what do u mean by complementary?
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