The issue is not the apeture, ISO or shutter time. These will affect the exposure levels (brightness) of the image. The important bit for colour control is the white balance. This needs to be matched to the light source.
I'm not familiar with Nikon, but on Canon bodies the white balance can be selected from a menu, or set on auto. Alternatively, shoot in RAW and correct the white balance in photoshop afterwards. But, also bear in mind that the colour your customers see will also be affected by the quality and characteristics of their monitor, regardless of how accurate the original image is.
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