Search found 129 matches

by Lowell Huff
Thu Apr 29, 2010 5:07 pm
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

"There in lies the rub"
That is precisely why we are having this discussion.
by Lowell Huff
Thu Apr 29, 2010 4:56 pm
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

Ornello:
Have you tried Clayton F 76plus Developer?
by Lowell Huff
Thu Apr 29, 2010 4:30 pm
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

Kieth The easy answer as to why the various forms of phenidone is, ultimately, the standard curve shape and resistance to heat in high temperature processing. Ornello Since I wasn't even a thought in those early years and obviously you were (Ha,Ha,Ha) I will accept your dates. The question was to di...
by Lowell Huff
Thu Apr 29, 2010 2:51 pm
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

Almost all powder formulas are pre 1920 in origin. As powders they are are not as sophisticated as modern liquid formulas. In pre 1920, Scientists did not have the advantage of all the research into photography that was done in the following sixty years. The pre 1920 formulas were designed for those...
by Lowell Huff
Thu Apr 29, 2010 1:02 pm
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

kIETH is ther a question? What would you like me to clarify?
by Lowell Huff
Thu Apr 29, 2010 12:27 pm
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

Kieth, Phenidone, by itself, is a very poor, slow speed developing agent, as documented by Grant Haist. The sodium sulfite in that formula is there as a silver solvent first, then an oxygen scavenger, to protect the P. When P or M are combined with HQ they then become what is described as a "superad...
by Lowell Huff
Thu Apr 29, 2010 12:04 pm
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

I didn't say they were bad formulas. I meant that they would not produce a,scientically measured, difference from other PQ formulas of the "modern" age of chemical formulas. You know, comparing apples to apples.
by Lowell Huff
Thu Apr 29, 2010 11:36 am
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

I cannot attribute any advantage to FX formulas using both P & M, other than marketing differentiation. Just as with the proclaimed "advantage" of "alkaline fixer over acid fixer", it cannot be supported with science. It is only OPINION.
by Lowell Huff
Thu Apr 29, 2010 10:51 am
Forum: The Digitaltruth Forum
Topic: Hydroquinone with Metol and Phenidone.
Replies: 45
Views: 221369

Re: Hydroquinone with Metol and Phenidone.

Guys, you are mis-informed about the relationship of the accelerators, Metol & Phenidone, and HQ. In the development process, Metol forms a salt with HQ and becomes ineffective. P acts as a catylist with the HQ to develop the exposed silver and then " searches for the next free HQ molecule", to cont...
by Lowell Huff
Thu Feb 18, 2010 4:38 pm
Forum: The Digitaltruth Forum
Topic: High contrast high resolution
Replies: 11
Views: 55428

Re: High contrast high resolution

JAMES: You asked for an answer to your issue. I have provided it to you. Now you dismiss me because you ASSUME that the price of our chemistry is too high. Have you given any thought to the fact that you are willing to pay extremely high prices for European manufactured chemistry just because it is ...
by Lowell Huff
Wed Feb 17, 2010 3:30 pm
Forum: The Digitaltruth Forum
Topic: High contrast high resolution
Replies: 11
Views: 55428

Re: High contrast high resolution

I can ship it to Europe. You can order it through Digital Truth. Cat # 51 1317,Packaged 4x1gallon case, dilutes 1+7.
by Lowell Huff
Wed Feb 17, 2010 10:48 am
Forum: The Digitaltruth Forum
Topic: High contrast high resolution
Replies: 11
Views: 55428

Re: High contrast high resolution

you need a high contrast, micro film developer. Our MS Micro Developer is my recommendation
by Lowell Huff
Thu Oct 15, 2009 2:57 pm
Forum: The Digitaltruth Forum
Topic: Agitation: does it affect contrast or grain?
Replies: 39
Views: 52146

Re: Agitation: does it affect contrast or grain?

Yes, Kieth the physical reaction of agitation does remove the inhibitors. Bromides and other inhibitors do not prevent the chemical reaction just slow it. Yes, you are also correct, saying that agitation does not make the developer more aggressive. Agitation brings more chemicals in contact with the...
by Lowell Huff
Tue Oct 13, 2009 11:07 am
Forum: The Digitaltruth Forum
Topic: Agitation: does it affect contrast or grain?
Replies: 39
Views: 52146

Re: Agitation: does it affect contrast or grain?

Agitaion, absolutely, affects both contrast and grain! More agitation results in faster development has the effect of increasing the shoulder, increased contrast. Greater development does increase grain, not beecause the silver-halide grains "grow"; they dissolve to smaller sizes. Thus the small gra...
by Lowell Huff
Mon May 04, 2009 2:02 pm
Forum: The Digitaltruth Forum
Topic: Image link HQ film
Replies: 7
Views: 9285

I think you will come to grief trying to make this film C/T. You can try our F 60 Film Developer @ 1+19 dilution, then you will have to experiment with developing times at 14 to 20 minutes.