Dry Gum Question, Is There A List?

I keep running into stamps that appear to be new but maybe have that dry gum. From what I unsderstand so far the gum is virtually invisible and makes the stamp look gumless. I have a block of 4 of the "Boston Tea Party" I'm looking at now and wonder if anyone has a set (DUH, probably everyone does, LOL) Is it one of these Dry Gum variety of stamps. Also is there a list out there of them all?

Thx, John

The Boston Tea Party stamps were NOT issued on dull/dry gum.
I know of no list of dull gum issues. In fact, some definitives were issued with both dull & shiny gum. Moreover, I can recall at least one that was issued with 3 different gum types ... dull, shiny & low gloss (still shiny, just a lot less shiny than usual). And to really make things confusing, there was one stamp that was issued with both low gloss gum & shiny gum ... but, in point of fact, both were relatively low gloss, yet one was not quite as glossy as its sibling.
Since I collect the different gum types, I always keep a Scott U.S. specialized catalogue at hand. Gum type is not deemed sufficiently different to warrant a separate catalogue number, but there are separate entries for the gum types under the same number ... frequently with different values. As I recall, some of the dull gum varieties are significantly rarer than the shiny ones, especially amongst the postage dues.
Added: Just realized that the Scott catalogue can't help you either. It only mentions gum type if a stamp was issued with 2 or more different types. This is similar to my complaint about tagging in Scott. They only mention the tagging type when more than one type is involved. Not ideal ... but I suppose they're saving a wee amount of catalogue space by minimizing the info provided. If it isn't needed to discern between two different stamps, it ain't mentioned.
Added: With a bit of practice and a good magnifier, you should be able to discern between a stamp with dull gum and one with no gum at all. There are striations in the dull gum that, if a stamp is held at an angle to a bright light, can be viewed under sufficient magnification. Used stamps, or unused stamps with gum removed, should show no such striations.
Added: A good set of stamps with which to practice striation viewing are the Great Americans. Some of the varieties can actually be identified from the angle of the striations. E.g., Scott 2170 (3-cent Paul White) was issued both tagged (2170) and untagged (2170a). Both stamps have dull gum. There is a rarer variety, 2170b, which is the untagged version of 2170 (left untagged by mistake). Scott indicates that you need a plate number 2 or 3 attached to the untagged stamp for it to be 2170b. What is less well known is that you can also identify it via the gum striations on the back ... vertical for 2170b , diagonal for 2170a.

It sounds like your Tea Party block has been soaked at some time in the past and actually has no gum.

JL - thanks for a wonderful post. Now I have something to look into / learn this cold winter weekend.

At the risk of sounding persnickety should the title be speaking of dull gum rather than dry gum? I have always, in the context of stamp collecting, known dry gum to be original gum which has dried and cracked.

As JL noted, there are different gum textures. The diagonal striations (closely spaced stripes) are probably the most common. On coils you can also have horizontal striations (complete or broken) and on sheet stamps I'm not sure if they are horizontal or vertical. But there are other types from rather smooth to bumpy - roughly similar to the pebble surface version of shiny gum (I think a goof example can be found on the Americana series). On the other hand, a soaked stamp will look rougher. (you could always take a cheap dull gum stamp and soak it to see the difference).

Here is some information on the first U.S. dull gum stamps:

which brings to mind, while most full gum is white, on some booklet panes it is yellowish