One does not have to "Screw Around", to get continuous tone. I have seen
tile floors done in full color continuous tone, and absolutely amazing.
Realize that dicromates are capable of sharpness far greater than any
existing silver process. Evidence of this was their use as the sensitizer
for coating silicon when making chips. Details so fine, the human eye and
any existing lens is incapable of resolving the detail.
I still prefer dry glazes as fine as possible.
RM