Ink consistency on US paper money

I noticed that on banknotes printed by different FRBs or at different years have either a lighter, or darker colour of ink. However, I didn't really think much of it.

Today, I was browsing the Bay, and came across this:
https://www.ebay.com/itm/1995-1-ONE...703663?hash=item4d90049eaf:g:uq8AAOSwx~lclnpM

The seller alludes that these are printed with different ink than $1 notes today.
Is there a truth to this, or has the same ink consistency always been used from around 1963- present?
(I didn't mention 1930s-1950s notes, because they obviously have a much greener hue than notes today, and deserve their nomenclature- "the greenback").

 

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The guy say he kept them in 1976. Yet, the bill are dated 1995. Proof of time travel?

 

I figured it was a typo...probably meant 1996.

Inks are formulated in-house at the BEP.

 

There was a problem in the 1990s with the black ink on the face flaking off.

 

notes are not printed by FRB's, they are made by the BEP either in DC or Fort Worth, the top note in the link was made at Fort Worth..

 

The term greenback, in regards to paper currency, dates further back than the 1930’s-1950’s. It dates back in the 1860’s.