[Athiril]

PhotoEngineer has posted on numerous occasions that Phenidone is unstable at high pH. This indicates to me that the destruction of Phenidone goes faster as pH is raised. Now if you look at the average fine grain B&W developer, you have pH of 8.2-9. If you look at E6 FD from the formula I linked to, you see pH 9.6. Therefore I would guess that E6 FD mixed with Phenidone is less stable than fine grain B&W developer mixed with Phenidone.

I wouldn't worry about it going bad in a day or two, but I wouldn't use it over a much longer time span. Mix the chemistry (1l per 10-12 rolls of film) for as many rolls as you can process within one or two days, use it, then discard. Not much different from using a regular kit, just a bit less time to process a batch of films.

First Developer lasts quite a while, both the working tank and replenisher. Both in small amounts in glass bottles for home processing, and large floating tank for dip and dunk (which is what I do here at work now).

There are two different CAS entries for CD-3, and both differ a bit, there is 25646-71-3 which is the one used on most products iirc, and there is also 24567-76-8.

For 25646-71-3 the data on different chemical website databases vary for that exact same CAS number and the molecular weight varies between 200 something g/mol to 800 something g/mol depending on which site you're on, so it can be annoying. Both 24-567-76-8 should be the 800 something version with a lot more sulphuric acid attached to it.


Here is one http://www.alibaba.com/product-gs/256474150/CD_3.html

There's also some companies that'll do direct b2b in smaller quantities I think it's an Indian one, with it's own site not through Alibaba.