Watermarks of Stamps of Brazil and mexico are too confusing for me! And the watermark fluid is to expensive for me to use on them. How do you read the watermarks?
Brazil Watermarks, can send one dizzy. Every journey starts with 1 step.
My route: Start with one Scott Type, say A75 "Aviation"
Set every one of your A75, on a table, do just 10 -15 a day, say.
Catalogue your result and separate into Scott numbers.
A good idea is to have alongside, a sheet of printed Watermarks you may encounter in the stamps you are working on, to keep referencing, esp with the sizes of Brazil's. The more you assess, the easier it will become.
Continue every day ad nauseum, till all done, you are now an expert on that stamp, write down your results for a graph.
If you get a difficult one, do your best, no one is perfect, guesstimate what wmk it is (I pencil in a small x on the back if difficult to read)
Watermarking: I have a small black plastic dish, a quick squirt of "Zippo" lighter fluid, using long nose pointy tweezers, place the stamp in the liquid
read the Wmk, and place on a clean sheet, with Wmk pencilled on the sheet' to keep all diff wmks separate, in piles, to dry.
Lighter fluid? I have an image of a stamp "expert" assessing a
3 Million Dollar stamp, using it. (It is not advised on some stamps, I cannot recall which right now)
You'll end up a Wmk wizard after a few hundred.
Have no experience with Mexico as yet.