Search found 190 matches

by sanchell
Mon Aug 05, 2019 10:37 am
Forum: Fixers
Topic: washing time with alkaline fixing
Replies: 5
Views: 280

Re: washing time with alkaline fixing

It's really quite simple. What you want is to wash the chemistry out of the emulsion. The uncoated back of the paper (RC or Fiber) will stick to whatever side it is against. So, if the emulsion is facing the back, the emulsion will stick to the back and washing cannot occur. However, if the emulsion...
by sanchell
Fri Jul 12, 2019 1:58 pm
Forum: Black & White Printing (formerly Enlarging & Printing)
Topic: Beseler 45A for Split Grade
Replies: 2
Views: 90

Re: Beseler 45A for Split Grade

While I am familiar with the 45A, I have to confess I've never printed using one. Hopefully, someone on the forum can help you with this.
by sanchell
Mon Jun 24, 2019 10:21 am
Forum: Black & White Film Development
Topic: Can Boric acid be used for Borax?
Replies: 3
Views: 211

Re: Can Boric acid be used for Borax?

I didn't have a copy of the Cookbook in front of me when I previously responded. Page 201 of the 4th ed. Borax Uses: As a mild alkali accelerator in fine-grain developers and those of low activity; ... Page 194 Acid, Boric Uses: As a buffer with borax to maintain a stable pH, even when the developer...
by sanchell
Sat Jun 22, 2019 9:13 pm
Forum: Black & White Film Development
Topic: Can Boric acid be used for Borax?
Replies: 3
Views: 211

Re: Can Boric acid be used for Borax?

Borax and Boric acid are not the same things. Borax is an alkali and in common grades is used in washing powder (20 Mule Team Borax). Boric acid is an ... acid. It is often used in roach poison. WARNING: Do not wash your clothes in boric acid! Keep out of reach of cockroaches. Boric acid is also use...
by sanchell
Sat Jun 08, 2019 11:53 am
Forum: Fixers
Topic: washing time with alkaline fixing
Replies: 5
Views: 280

Re: washing time with alkaline fixing

With FB paper in alkaline fixer, fix for two minutes, 1 minute in a first bath and 1 minute in a second bath with a 15-second drain between. When the first bath is exhausted I dump it and move the second bath to take its place and mix a fresh second bath. Note that 90% or more of fixing is done in t...
by sanchell
Tue Jun 04, 2019 9:35 am
Forum: Errata
Topic: Hypo clear formula
Replies: 3
Views: 341

Re: Hypo clear formula

They make great stocking stuffers!
by sanchell
Tue May 28, 2019 9:23 am
Forum: Errata
Topic: Hypo clear formula
Replies: 3
Views: 341

Re: Hypo clear formula

Hypo Clearing Agent (HCA) is nothing more than sodium sulfite. The formula in the DCB is Water at 125F/52C, 750.0 mol Sodium sulfite, 200.0 g *Sodium bisulfite, 50.0 g Water to make 1.0 liter *The sodium bisulfite lowers the pH in order to prevent softening of the film emulsion. If paper is to be us...
by sanchell
Sat May 25, 2019 4:43 pm
Forum: Toning
Topic: Thiourea toning problem.
Replies: 1
Views: 245

Re: Thiourea toning problem.

Sodium carbonate is an alkali that works as an accelerator. Why don't you try adding that and see what happens? Second, Ilford uses a lot of hardener in their paper, far more than when many of these formulas were written. This came about as part of a three-way competition between Kodak, Agfa, and Il...
by sanchell
Sat May 18, 2019 11:24 am
Forum: Member Announcements
Topic: The Darkroom Cookbook 4th Edition
Replies: 8
Views: 3208

Re: The Darkroom Cookbook 4th Edition

There are two cryptic posts from you on the Darkroom Cookbook Forum. As we have had problems with people on this site purporting to be darkroom workers who in fact were not, would you please identify yourself, a web site would be good, and explain what you mean by your posts.

Thank you.
by sanchell
Fri May 17, 2019 3:55 pm
Forum: Darkroom Equipment for Sale
Topic: LF darkroom equipment for sale
Replies: 11
Views: 2953

Re: LF darkroom equipment for sale

Heiz, What is this about?
by sanchell
Mon Jan 08, 2018 9:21 am
Forum: Black & White Film Development
Topic: Dr. Roland F Beers variable contrast paper developer
Replies: 5
Views: 599

Re: Dr. Roland F Beers variable contrast paper developer

The Beers formula was being used to alter contrast on graded paper since Ansel was wearing knee pants. I have seen it published in numerous older texts but not one of them has been written by Dr. Beers, they are all simply reproductions of his formula. And you are correct, they may not be the origin...
by sanchell
Sat Jan 06, 2018 11:18 am
Forum: Black & White Film Development
Topic: Dr. Roland F Beers variable contrast paper developer
Replies: 5
Views: 599

Re: Dr. Roland F Beers variable contrast paper developer

My response to this post was slightly rushed last night. What I failed to mention is that Beers formula has been around for a very long time, and was in use when I began my career in 1970. In the 1983 version of The Print, Ansel Adams mentions it in three places in the text and provides the formula ...
by sanchell
Sat Jan 06, 2018 10:48 am
Forum: Black & White Film Development
Topic: Edwal FG-7
Replies: 1
Views: 299

Re: Edwal FG-7

I, too, was a great fan of FG-7.

The formula was proprietary and Edwal never published it. Someone at Edwal did give me a version that they said was authentic, but the formula did not make much sense to me. It is published in one of the earlier versions of the DCB.
by sanchell
Fri Jan 05, 2018 6:00 pm
Forum: Black & White Film Development
Topic: Dr. Roland F Beers variable contrast paper developer
Replies: 5
Views: 599

Re: Dr. Roland F Beers variable contrast paper developer

Saludos, Jesus. If it is simply the formula you're after you can also find it on page 282-283 of DCB4 or p. 287 of DCB3, as payral suggests. There are two VC paper developers of which I am aware. Dr. Beers formula is the most well known and the one I learned in the '70s. The other is Kodak D-64, whi...
by sanchell
Thu Jan 04, 2018 11:12 am
Forum: Black & White Film Development
Topic: Developing C41 in BW chemistry
Replies: 5
Views: 2049

Re: Developing C41 in BW chemistry

Great images, John, and ones you'll cherish for years to come, grain and all. :)
by sanchell
Wed Jan 03, 2018 12:33 pm
Forum: Black & White Film Development
Topic: dissolving phenidone
Replies: 3
Views: 418

Re: dissolving phenidone

What could I use instead to dissolve Phenidone? Phenidone does not dissolve readily in water, but is relatively easy to dissolve in distilled water at a temperature of about 175F/80C. It is readily soluble in solutions of alkali bisulfites and carbonates. This allows it to be readily incorporated i...
by sanchell
Tue Jan 02, 2018 1:47 pm
Forum: Black & White Film Development
Topic: D-23 Divided
Replies: 8
Views: 860

Re: D-23 Divided

I read in The Film Developing Cookbook about adding Sodium Chloride to D-23. Do you have any additional thoughts about doing so? I read somewhere (Large Format Forum perhaps?) that D-23 + Sodium Chloride is essentially Ilford's Perceptol. Don't know if that is valid though. Perceptol is one of the ...
by sanchell
Tue Jan 02, 2018 12:05 pm
Forum: Black & White Film Development
Topic: Percentage solutions
Replies: 3
Views: 404

Re: Percentage solutions

Crawley's classic FX 37 formula uses 0.5 g of Phenidone. It is far easier to measure out 50 ml of the 1% solution to use in a liter of FX 37 than trying to accurately weigh 0.5 g each time. I've just been corrected by Bill Troop on this. Rather than trying to paraphrase what he said here is what he...
by sanchell
Mon Jan 01, 2018 6:43 pm
Forum: Black & White Film Development
Topic: Percentage solutions
Replies: 3
Views: 404

Re: Percentage solutions

Darkroom Mike. Probably Enlarging and Printing would have been a better place for this, Darkroom Mike. But hey, who cares? We're just a bunch of guys and gals trying to share what we know. You've listed the three most commonly used percentage solutions. These are the three I list in the DCB. Edwal u...
by sanchell
Mon Jan 01, 2018 5:37 pm
Forum: Black & White Film Development
Topic: D-23 Divided
Replies: 8
Views: 860

Re: D-23 Divided

BZT is most commonly used to reduce fog in high pH developers that contain Phenidone. That said, I can think of no practical reason not to at least try it in a test batch. It's action will be greater than that of bromide. Normally you would start with 1/10 the solution concentration of bromide, but ...
by sanchell
Thu Dec 28, 2017 3:09 pm
Forum: Workshops and Seminars
Topic: FREE PHOTO CATALOG WORKSHOP
Replies: 1
Views: 491

Re: FREE PHOTO CATALOG WORKSHOP

I hope your workshops are going well.
by sanchell
Thu Dec 28, 2017 3:08 pm
Forum: Darkroom Equipment
Topic: Darkroom fabric
Replies: 2
Views: 431

Re: Darkroom fabric

I have some, too. Good stuff. I use black barrier plastic over my windows. I purchased it from a builder's supply, about $20 for a 10' x 50' roll. Attach it to a 1x1" or 2x2" wooden frame. Hang the frame from two or more nails, screws, etc. placed just above your window (inside or out). Store when n...
by sanchell
Thu Dec 28, 2017 2:20 pm
Forum: Errata
Topic: Formula #28 Mytol
Replies: 1
Views: 375

Re: Formula #28 Mytol

On reading the formula #28 Mytol on p.244 [the same is valid for the formula #26 of the 3rd Ed. on p. 218) there is a footnote about dissolving the Phenidone in methyl hydrate. I would say "methanol" or methyl alcohol, right? The formula and nomenclature is as Paul Lewis submitted. Paul is Canadian...
by sanchell
Thu Dec 28, 2017 2:06 pm
Forum: Errata
Topic: Formula #47: Kodak Research Lab
Replies: 3
Views: 489

Re: Formula #47: Kodak Research Lab

Great tip, Jesús, Thank you.
by sanchell
Mon Dec 18, 2017 11:59 am
Forum: Color Film Processing
Topic: C-22/C-41 Cross Process - Is It Possible?
Replies: 2
Views: 465

Re: C-22/C-41 Cross Process - Is It Possible?

Sounds like you're breaking new ground, Jeremy. Please keep us posted on how it goes.