Blue Cancel Question?

I recently got some US stamps from around 1982 and noticed that some of the cancels were a blue color. A color something similar to one of those old mimeographed pages we used to get in school. The cancels look like they are from a automatic cancel and not a hand stamp cancel. Was the USPS playing around with different colors for auto cancel at the time? Or did I get something that someone just over soaked?

Sorry guys there wasn't any of that mimeo smell I remember so well.

Hello Vacuum Man

My understanding about the modern blue, and other coloured cancellations, is that they are not really un-common but in the majority of cases is the colour of ink available to any given postal employee at the time while processing the mail (?)

Maybe another member can be more specific??

Chimo

Bujutsu

Maybe the postal employee that ran the cancel machine very much liked that smell too!
Hence the usage of the blue mimeo type ink...