You Tell Me What Caused This..?

Take a look at these 2 stamps..The Scott 192 on the left is a normal stamp..But, look at the one on the right..It is more than just over inked..Lets see if you can analyse what happened to this stamp.

Robert

Robert, that's a hard one. It looks almost not like over inking but like the whole ink well was spilled on it. On your picture it looks dirty, but I guess it is not really?

Peter

Yes Peter..It is a hard one to analyse and if you look at the numerals you would almost swear they are re-entry marks.

Robert

The manner in which it was scanned? I often see different markings on the laptop then the stamp. Shadows etc.

Classic PVC storage damage. The PVC softens the inks and makes it diffuse thru the paper... left in PVC it will turn black eventually. Some catalogs will be reviewing their listings for "aniline" inked stamps as storage or mounting in PVC gives an "aniline" effect.

IIRC From an mixed auction box "She says they must go" 6 or so years ago.
Stamps stored in Vinyl Coin Pockets

Note the Queen Elizabeth and the bottom King George
Vinyl sucks the life out of some stamps, others remain unchanged.

One rule of thumb is to not use plastics that have a greasy/oily feel and look. A strong odor is bad also. That's plasticizer that keeps material used for photo album pages etc. from becoming brittle, but it also is something that soaks into paper readily. I don't know why that stuff was even used for coins. It's absorbed by the dirt and oxidation and you end up with what is a cleaned coin.

The safe-for-stamps/archival quality pages may be slick to the touch but are not greasy.

Then use Vario, they are made of polyester not vinyl

https://www.lighthousecanada.ca/var...pockets.html




According to the Postal Museum it's safe to use them with stamps.





https://postalmuseum.si.edu/collect...lastics.html

here from a pack

scotzm..Good theory..There is one more theory..When I was in Hugh School being trained as a printer for 4 years and for a little time after High School...I came across the same sort of thing..As I adjusted the roller dispenser on a A.B. Dick printing machine (and same thing with older type of machines), The first adjustment (remember when removed cant always be paced with exact clearance), is when a very spotty heavy ink was produced...After a few sheets it was cleaned up.

So what we COULD have here is Printer"s waste.

Robert

You have to much ink on that stamp to be a reaction with plastic, something happen at printing. Is that mold I see ????

Looks like there is a crease on the stamp and maybe the paper was wet too much before printing and/or the printing plate was not properly wiped of ink.