If the original color is blue, then its color afterimage would be

The correct answer is the color yellow.
An afterimage is best described as a photograph that continues to seem in a single's imaginative and prescient after the publicity to the original picture has ceased. An afterimage may be a ordinary phenomenon or may be pathological. Illusory palinopsia can be a pathological exaggeration of physiological afterimages. Afterimages arise due to the fact photochemical activity in the retina keeps even whilst you are no longer experiencing the unique stimulus.