Fire is perceived to be red in colour. On international signage, red indicated the prohibitation of movement, the possibility of danger and a warning to use extreme caution. Universally similar opinions and emotions are evoked by the colour red. American’s believe that red is considered a loud colour, promises excitement; it is a powerful symbol of vibrancy and life, but also of danger and death. In the Kabalah, red refers to love, sacrifice and sin. Scarlet is fire. In china, along with being the colour symbol for fire, red means summer, the south, good luck, joy, good fortune and fertility and in most Indian mythology red is the colour of the sun.

This may be true for the majority of the population without synaesthesia however for the other portion it is possible that “…red may cause a sensation analogous to that caused by a flame, because red is colour of flame. A warm red will prove exciting, another shade of red will cause pain or disgust through association with running blood. In these cases colour awakens a corresponding physical sensation, which undoubtedly works upon the soul.”