Maybe in connection with this - violet is the last color the human eye can catch before an object vanishes into a new form.
Chapter 9
Then as the speed is increased, the red melts into an orange. Then the orange melts into a yellow. Then follow, successively, the shades of green, blue, indigo, and finally violet, as the rate of sped increases. Then the violet shades away, and all color disappears, the human eye not being able to register them.
https://kybalion.site/vibration/