math, ugh!

[Kin Lau]

The _current_ recommendation for Rodinal is 10ml, but that number has been as low as 3 or 5 ml in the past. Do a search on pnet. At 3ml per roll, the stuff would last forever, which is probably why Agfa bumped up the recommendation. Of course, it'll also depend on what sort of wierd junk you have in your tap water.

 

[Roman]

Also, the concentration of Rodinal was changed over the years - you can still get the original stuff as Calbe R09 or Foma F09, and you have to dilue that 1+40 to get the same concentration as Agfa Rodinal 1+25. The Calbe stuff is slightly cheaper, but comes in really bad bottles, and since the Agfa stuff is also really cheap, I never bothered with the Calbe variety after I finished my first bottle.

Roman

 

[Stu :)]

Actually, it never occured to me to read them until this subject was discussed very controversially on German B&W lab forums....

Roman

Bayer NZ/Agfa was nice enough to send me their B&W bible for free.
The non-technical writing is, well very flowerly, PC and quite polite. However turn 2-3 pages over to the technical sections and words like "Must", "Have To", "Always", "This Is The Correct Time/Speed"...

I almost expected to read at the back of the book:
"If you do not follow this book to the letter, were sending someone around in a Tiger tank, schnell schnell schnell!"

Stu

 

[Stu :)]

Btw, concerning Rudman's bible on toning: it is on sale now at Amazon, and rumor has it that there won't be a second edition - if you are into toning your own prints, this book is a must!

Roman

Correct. Same applies to the lith printing book.

Which reminds me, I've got 10 litres worth stock lith developer I should use at some point...

Stu