Red: It's the color of passion

Known as as a very emotionally-striking hue, red symbolizes many things from love and Valentine's Day, to blood and war. Phsyciologically, red stimilates the adrenaline glands and activates the senses.  This attention-getting color is strong-willed itself, expressing strong emotions to the viewer. It's even proven that wearing red improves confidence in the wearer and commands the presence of others. If you want to create a visually-exiciting, emotionally-striking soap, then red is your color. 

Red Cherry Bath Jello Soap from TemptationsBathNBody's Etsy Store

Raspberry Vanilla Shea & Cocoa Butter Soap from Simply Suds Etsy Store

Cinnamon Red Hots from CatherineFilippelli's Etsy Shop