Jackson 2 Cents 1870 - 1875.

Have 2 different shades of color of the same stamp. As per scott this series or design were issued in 2 basic colors brown and vermilion. Am not sure which of these could be considered vermilion. If one is a vermilion than what color the other would be considered. Inputs and feedbacks most appreciated. Thanks.

There were two printings in vermillion. Scott 178 & 183. They were also done by two different printers. The first is on a yellowish wove paper and the second is a soft porous paper.

Also, the stamp on the right looks like the wove paper.

Is there a possibility of fading of the one on the right due to light exposure?

More likely oxidation of the yellow chromate on the one on the left.

I was in the coating business for over 20 years. Liquid paints and inks have much in common. Considering the amount of work the different post offices did and the colors they printed in I'm amazed there wasn't more variation in the shades. Also as Russ stated there are metals used in the inks that will change from the humidity level, sunlight and exposure to air. Add in the different papers and printers to the equation. After 100 years in existence it will show changes. It all makes it more difficult to distinguish real color variations to altered colors.