Charkhari State (of the dreaded Post Office glue pot) played around with the colours of its stamps in the 1930s and 1940s. It used four different colours for the ½ Anna. Here are three - missing the scarce black:

with the ½ brown on cover:

and three for the 1 Anna:

and the 1 Anna brown(ish) on cover:

one copy having been removed with powerful steam machinery.
The different colours may have been intended to extract money from the collector; Charkhari certainly had form in that area. Still, it would have cost a total of somewhere in the neighbourhood of $US0.05 to buy one of each of the ½ and 1 Anna colours, so hardly outrageous.
Incidentally, Charkhari seems to have had a bit of a thing for
brown stamps. In 1909, it produced a brown ¼ Anna bottom value and a brown 1 Rupee top value of the set it released that year. (I recall someone once remarking that the first task of a new wife was to go through her new husband's wardrobe, and eliminate all his brown clothes.)