1 Anaphylaxis is the most severe allergic reaction and is potentially life threatening. 2  Anaphylaxis is rare. The vast majority of people will never have an anaphylactic reaction.  Common triggers of an anaphylactic reaction include drugs, such as penicillin, insect stings, foods (peanuts, shellfish), X-ray dye, and latex.
A rainbow has depth to it, all along the radius refraction angle of 45 degrees. A halo around the moon on vaporous clouds has red and magenta on the outside, the yellow is minor, green and cyan are the inside colors. The lighter area is to the inside. A moon bow is magenta, white, green, and rare.
Violet is the final color of the rainbow, making up the inner outline of the rainbow's arc. Its wavelength is the shortest of the rainbow colors. At times it can blend in with the blue and indigo of a rainbow, but it is often visible to the naked eye and will stick out from the rest of the colors enough to be noticed.