I, The Invincible Villain Master With My Apprentices - Ch. 53

[MangaDex]

 

[Liver]

fell for the oldest trick in the book

 

[FirenzeClipper]

Why's green mentioned twice?

 

[Tonytakanawa]

Why's green mentioned twice?

It's a mistake. It's supposed to follow the 7 colors of the rainbow, but there are 8 colors mentioned if you include the second green. Also, cyan should be indigo.