Page 1 of 7 123 ... LastLast
Results 1 to 10 of 66

Thread: mixing my own developer supplies

  1. #1

    Join Date
    Sep 2018
    Posts
    135

    mixing my own developer supplies

    I know this is probably real easy and I'm probably over thinking but it has been about 25 years since I mixed up a developer from scratch. I only did it once, it was in a college chemistry lab, under a hood, weighing with a triple beam balance, using a magnetic stirrer.

    I've ordered the chemicals for Pyrocat-HD but realized I have no lab ware. Can someone recommend the dishes and lab supplies I will need?

    Is a regular digital food scale (dedicated to this obviously) acceptable?

  2. #2
    jp's Avatar
    Join Date
    May 2009
    Location
    Maine
    Posts
    5,362

    Re: mixing my own developer supplies

    You can get little drug dealing scales on ebay/amazon that measure the small amount of grams for most of this stuff quite inexpensively.

    The powdered pyrocatechin is bad stuff to have loose in powder form, so dispense and dissolve that outside.

  3. #3

    Join Date
    Sep 2018
    Posts
    135

    Re: mixing my own developer supplies

    Quote Originally Posted by jp View Post
    You can get little drug dealing scales on ebay/amazon that measure the small amount of grams for most of this stuff quite inexpensively.

    The powdered pyrocatechin is bad stuff to have loose in powder form, so dispense and dissolve that outside.
    Are those scales called pocket scales?

  4. #4

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,492

    Re: mixing my own developer supplies

    Quote Originally Posted by aaronnate View Post
    Are those scales called pocket scales?
    Oahus

  5. #5
    jp's Avatar
    Join Date
    May 2009
    Location
    Maine
    Posts
    5,362

    Re: mixing my own developer supplies

    Quote Originally Posted by aaronnate View Post
    Are those scales called pocket scales?
    Yes

  6. #6
    Steven Ruttenberg's Avatar
    Join Date
    Sep 2017
    Location
    Mesa, AZ
    Posts
    2,489

    Re: mixing my own developer supplies

    I prefer tripple beam balance, no batteries, easily calibrated, works for forever and as accurate if not more so than any digital scale in the same class of weights being measured.

  7. #7

    Join Date
    Jul 2016
    Posts
    4,565

    Re: mixing my own developer supplies

    Quote Originally Posted by aaronnate View Post
    Is a regular digital food scale (dedicated to this obviously) acceptable?
    Yes, but even the best Lab scale requires Calibration Weights, some $6, Amazon, to know if it works ok.

    Click image for larger version. 

Name:	71cYK7SmaEL._SL1500_.jpg 
Views:	11 
Size:	33.3 KB 
ID:	186283

    You also would need an additional precision jewelry type Scale, with 0.01gr or better 0.001gr precision, say a $10 one, some include and small calibration weights set, if not you will also need one. That scale would be of 100 to 500 max load.

    Click image for larger version. 

Name:	61MvBCJL23L._SL1200_.jpg 
Views:	13 
Size:	47.7 KB 
ID:	186284


    You may need that small scale for some ingredients, for example to mix 1 Liter of Mytol, (Xtol substitute) you need to measure 0.15gr of phenidone, you would not be able to do it with a food scale.

    Best way is having two scales, a food type one for say 40gr and up, and a jewelry one for under that. And, I reiterate, it's important having calibration weights.

  8. #8

    Join Date
    Jun 2014
    Posts
    1,756

    Re: mixing my own developer supplies

    You can make a 5% phenidone stock solution in 96% ethanol. Easier to weigh and measure and lasts quite long.

  9. #9

    Join Date
    Jul 2016
    Posts
    4,565

    Re: mixing my own developer supplies

    Yes, but then you need 50grs of phenidone, worth to make 333L of Mytol (50/0.15), adding cost of Ethanol this is 3x the cost of the jewelry scale, with a single ingredient.

    Belive me, the small scale is a must... any ingredient under 10gr may have a 10% error with a food scale, or 20% if it has 2gr steps, ...and having to dilute many ingredients, this is a mess...

    I use mine for DIY emulsions, to me it would not be practical the food scale, which I use when weight is larger.

  10. #10
    Foamer
    Join Date
    Oct 2010
    Location
    South Dakota
    Posts
    2,149

    Re: mixing my own developer supplies

    I'm on my state's grand jury. I'll mention that if you keep one of these scales in your car and it has white powder residue on it, any cop stopping you for a traffic violation is going to go nuts when he sees that scale.


    Kent in SD
    Qui sedes ad dexteram Patris,
    miserere nobis.

Similar Threads

  1. C-41 supplies
    By ronald moravec in forum Darkroom: Film, Processing & Printing
    Replies: 36
    Last Post: 16-Sep-2018, 17:35
  2. Kodak Tmax RS Developer Mixing and Use
    By Ted Felton in forum Darkroom: Film, Processing & Printing
    Replies: 19
    Last Post: 3-Oct-2007, 14:11
  3. Film/developer/paper/developer combination
    By Sal Santamaura in forum Darkroom: Film, Processing & Printing
    Replies: 4
    Last Post: 31-May-2004, 21:53
  4. where to get darkroom supplies?
    By Jon Paul in forum Darkroom: Film, Processing & Printing
    Replies: 7
    Last Post: 25-May-2002, 00:50

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •