In common usage, Russian Empire banknotes were often named after their color.
Yellow — 1 ruble. "Anna took out three yellow papers from her purse" (Saltykov-Shchedrin's "The Golovlyov Family").
Green — 3 rubles. In Dostoevsky's "Crime and Punishment," "the official gave Katerina Ivanovna a three-ruble green note."
Blue — 5 rubles. Chichikov promises Korobochka 15 rubles "in blue notes."
Red — 10 rubles. In Tolstoy's "Resurrection," Katyusha Maslova shows the court that she "took four red ones."
White — 25 rubles. "I'll take a white one for the landscape," says the art dealer in Gogol's "The Portrait."
Rainbow — 100 rubles. Fyodor Pavlovich Karamazov dropped "three rainbow papers in the mud."
Gray — 200 rubles. In Herzen's "My Past and Thoughts," the secretary who received a bribe declares, "Well, it's gray, all the better, let the other petitioners see, it will encourage them when they find out I took 200 rubles, but I settled the matter."