Neutol - stock / concentrate shelf life

Discussion in 'B&W: Film, Paper, Chemistry' started by jansenh, Jul 5, 2003.

  1. jansenh

    jansenh Member

    Apr 7, 2003
    Stavanger -
    Hello all!

    The Agfa Neutol paper developers are from concetrate supposed to be diluted 1:3 once opened and stored in glass bottles as stock solution.

    Once I tried to not proceed the normal way, I simply opened a Neutol concentrate and used it for a couple of weeks to mix 1:11 directly from conectrate. That didn't work at all,.. after some weeks the concetrate went dark yellow/brownish and was destroyed.

    I hate mixing, pouring and measuring, cleaning & storing bottles... so I decided to try another approach on the same theme... using Neutol as a "mix-straight-from-concentrate" developer... This time I opened a 1.25 litre bottle of Neutol WA, poured it in a brown glass bottle (those thight-capped special seald bottles from the pharmacy) and filled the bottle up with glas-marbles to avoid air in the bottle. Evey now and the when I use 100ml of the concentrate I put in more marbles, keeping the fluid level to a maximum, avoiding practically all air inside this bottle.

    anyone else been down this road? The thing is that I haven't had this system going long enough to be sure if it is working, and now I am about to open a Neutol NE bottle, and maybe a Tetenal Eukobrom.

  2. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member Moderator

    Sep 7, 2002
    Honolulu, Ha
    Large Format
    I've used the marble trick in the past. Works very well. With Neutol WA, I just squeeze the bottle as I use it, and so far so good.