Compare the analytical wavelength for the green food dye with those of the blue

Question

Compare the analytical wavelength for the green food dye with those of the blue and yellow dyes. (1) What is(are) the analytical wavelength(s) of the yellow dye the blue dye the green dye What would you expect the spectrum of a solution that was a mixture of yellow and blue food dyes to look like? What would be the color of a solution made by mixing yellow and blue food dyes? Briefly explain why it was important that the beakers in which you prepared the dye solutions for Part III of the experiment were clean and dry before you began.

Explanation / Answer

[1] Analytical wavelengths of,

the yellow dye = 560-600 nm

the blue dye = 625 nm

the green dye = 450-560 nm

[2] The spectrum of yellow and blue food color dyes will show absorbance peaks in region 400-450 nm for violet light and 600-640 nm for orange light. These are complementary colors of yellow and blue color dyes.

[3] The color of the solution made by mixing yellow and blue food color dyes would be green.

[4] The beaker in which the dye solution is prepared must be thoroughly clean before making solutions as any impurities present may give rise to additional absorption peaks in the UV spectrum.  

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