Light warm red has a certain similarity to medium yellow, alike in texture and appeal, and gives a feeling of strength, vigour, determination, triumph. In music, it is a sound of trumpets, strong, harsh, and ringing. Vermilion is a red with a feeling of sharpness, like glowing steel which can be cooled by water. Vermilion is quenched by blue, for it can support no mixture with a cold colour. More accurately speaking, such a mixture produces what is called a dirty colour, scorned by painters of today. But "dirt" as a material object has its own inner appeal, and therefore to avoid it in painting, is as unjust and narrow as was the cry of yesterday for pure colour. At the call of the inner need that which is outwardly foul may be inwardly pure, and vice versa. The two shades of red just discussed are similar to yellow, except that they reach out less to the spectator. The glow of red is within itself. For this reason it is a colour more beloved than yellow, being frequently used in primitive and traditional decoration, and also in peasant costumes, because in the open air the harmony of red and green is very beautiful. Taken by itself this red is material, and, like yellow, has no very deep appeal. Only when combined with something nobler does it acquire this deep appeal. It is dangerous to seek to deepen red by an admixture of black, for black quenches the glow, or at least reduces it considerably.

Source: Concerning the Spiritual in Art by Wassily Kandinsky c/o THE BINDING AGENCY http://www.gutenberg.org/cache/epub/5321/pg5321-images.html https://www.bindingagency.com