How to Use the Psychology of Color to Increase Website Conversions
Color wields enormous sway over our attitudes and emotions. When our eyes take in a color, they communicate with a region of 
the brain known as the hypothalamus, which in turn sends a cascade of signals to the pituitary gland, on to the endocrine system, and then to the thyroid glands. The thyroid glands signal the release of hormones, which cause fluctuation in mood, emotion, and resulting behavior.
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https://blog.kissmetrics.com/psychology-of-color-and-conversions/