Replenished developing systems

Photo Engineer · Jul 19, 2008

Well, that is using the sulfite at high levels for the same reason as in other formulas. I was thinking of low sulfite developers which could be speeded up a tad with no significant sulfite (solvent) effect.

Also, "H" acid and "J" acid are often used in these formulas as "colorless" couplers that dissolve in water and speed reaction rate.

PE

Ian Grant · Jul 19, 2008

Now your testing me, and as all my reference books with Colour processing are in the UK I give up on "H" acid and "J" acid.

I had an idea but lets take it off public view, PM sent Ron.

Ian

Photo Engineer · Jul 19, 2008

I did a search on H acid and came up with - Encyclopedia Brittanica. They have several paragraphs on this "coupler" being used in the dye industry.

PE

Ian Grant · Jul 19, 2008

and in Hair dyes, as are colour couplers :rolleyes:

It might be far cheaper to buy a C41 or E6 kit and wash your hair in the Colour developer of course adding the right colour coupler.

You could go back to Kodak management and suggest a new Division - Kodak Kodachrome Polychromatic Hair Coloring

Very easy to market, Microsoft used his wife to launch Windows 95, and Paul Simon is the right target age, plus he already has the Kodachrome song in his back catalogue . . . .

And then "Remember those Kodak moments of your youth, with Kodak Kodachrome Polychromatic Hair Coloring you can look & feel as young again"

Joking apart it's the same technology.

Ian

Photo Engineer · Jul 19, 2008

Agfa patened "white couplers" for this same purpose in films, but not hair. I suppose it would work though. Most of these form green or cyan dyes.

PE

Christiaan Phleger · Jul 19, 2008

Isn't Pheindone basically red hair dye?

Ian Grant · Jul 19, 2008

It doesn't form a red dye with PPD & derivatives.

No idea, my hair is naturally di.....s.....a p e a .r ing so not a lot left to try Phenidone on & I have better uses for Phenidone.

Ian

Photo Engineer · Jul 19, 2008

Phenidone is not a dye.

PE

Larry Bullis · Jul 19, 2008

Thanks. It's looking like maybe something else may be in order.

How about leaving out the TSP altogether, make a stock solution of Catechin and PPD with a larger amount of sulphite and activate it before use with a shot of acetone?

My issue with the replenishment isn't so much that I want to keep the mix alive, I just don't want to be mixing all the time, especially if traveling (I develop film in my truck camper). If I could make a concentrated enough stock, that would be preferable. I know that it might be pretty hard to get enough ppd into solution to allow a concentrated stock, though.

Or how about packets of premeasured dry chemicals, to mix as needed? That could work.

It probably seems like an odd choice to begin with. I like the scale and the texture, and I still have about 100' of Kodak's Aerial 70mm version of the BW infrared to use up.

Larry Bullis · Jul 19, 2008

RidingWaves said:
Isn't Pheindone basically red hair dye?

You must be thinking of paraphenylene diamine; it is used in hair color. Isn't it what produces that dark reddish color?

Maybe I'll just take my film to the nearest quicky hair place for developing.

Christiaan Phleger · Jul 20, 2008

Ah, that's it. I knew one agent has a common use as a basic start to the red color in hair 'dyes'.

Photo Engineer · Jul 20, 2008

Aniline used to be used, but it was too toxic and caused a lot of allergic reactions.

PE

Replenished developing systems

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