I don't know that I believe this. With commercially available gelatine
silver paper the exopsure ranges for various grades of paper are as follows:
Maximum negative density
that may be fully printed
Paper Grade (i.e. full black to full white)
________________________________________________
5 0.50 - 0.64
4 0.65 - 0.79
3 0.80 - 0.94
2 0.95 - 1.14
1 1.15 - 1.40
0 1.40 - 1.70
Now this does not include grade 00 which someone mentioned -- I have no
information on that, though judging from the trend indicated from the
table above, I would guess (no, I don't know for sure, and I could be
wrong) that it would not be capable of handling a negative with a 3.00
density range. Also, this table only pertains to commercial papers, so I
can speak for any homebrew gelatine silver papers.
David, the obstinate. :)