Blue is a bathroom neutral colour. Looking at the rainbow we see red, orange, yellow, green, blue and violet. When someone makes an advertisement for diapers or feminine hygene products, red, orange and yellow are obviously too close to the colour of bodily fluids and thus are not permissible. The remaining colours are bathroom neutral, but green seems close to yellow and violet seems close to red, so blue is the colour most often used for commercials.

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