Quote Originally Posted by Lee Shively
I used to know how to mix photographic
chemicals. Now I have no idea what I'm doing. Send help. My
head is about to explode!
I sympathize. I read a thread similar to this a year or two ago
at rec.photo.darkroom. I'd always used the universall convention
of the colon when expressing ratios. I've returned to darkroom work
after many years absence.

I read a number of posts declaring that the unique nature of
photographic chemistry sets it apart from all else when expressing
ratios. So, I adopted the + ; 1+1+8 rather than 1:1:8. The first
reads one part A PLUS one part B PLUS eight parts C while the
second reads one part A TO one part B TO eight parts C.

To make a long story short, I've gone back to the universally
used convention of the colon when expressing ratios. The colon
is just TOO universally used. I think I've been using it for at
least 50 years and not been once out of line in doing so. Dan