Question: Suppose that you are a colour chemist and had been asked to intensify the colour of a dye without changing the type of compound, and

Suppose that you are a colour chemist and had been asked to intensify the colour of a dye without changing the type of compound, and that the dye in question was a polyene. Would you choose to lengthen or to shorten the chain? Would the modification to the length shift the apparent colour of the dye towards the red or the blue?

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