Sharon, you hit the nail right on the head. But, the size of the
granules makes it difficult to make your own granulation sieve.
In the Oppi bigbbook, page 360 there is a picture of a
"ten-tiered sieve" made by Carl Fischer, Pforzeim ( I assume
Oppi speaks about granules between 0.008 inches (0.205 mm) and up
to 0.032 inches (0.762 mm).
My calculator says 1.000 divided by .008 would allow 125 granules
to the linear inch or 15625 granules to the square inch.
Please, don’t sneeze.
For the masters in granulation see some pictures (library?) of
Etruscan jewelry. They did such fine work that it looks like a
surface finish rather than an add-on.