Search found 879 matches

by Ornello
Wed Jul 19, 2006 10:03 am
Forum: The Digitaltruth Forum
Topic: White Specs in Emulsion
Replies: 22
Views: 29083

Lowell Huff wrote:How does it harm fixer? What is the chemical reaction that harms fixer?
You can look this up in any good photo chemistry book.
by Ornello
Tue Jul 18, 2006 3:11 pm
Forum: The Digitaltruth Forum
Topic: White Specs in Emulsion
Replies: 22
Views: 29083

Developer carry over does not cause fixer to deteriorate. The purpose of stop bath is to stop development. Modern fixing formulas are buffered against pH change. That being said, acid, neutral or alkaline pH of fixers has no scientificly measureable effect on fixing. It is thio sulfate the combines...
by Ornello
Tue Jul 18, 2006 11:58 am
Forum: The Digitaltruth Forum
Topic: Camera: Which one i should buy for beginner
Replies: 6
Views: 12207

Re: Camera: Which one i should buy for beginner

hi guys im new here.im doing my diploma of design, and on of my unit is photography. soon, i have interest in photography,i found challange me, and of course, the unit assigments make me want do do more experiments for the start i used Film camera which is nikon F90 and nikon F60. i found they are ...
by Ornello
Tue Jul 18, 2006 11:57 am
Forum: The Digitaltruth Forum
Topic: White Specs in Emulsion
Replies: 22
Views: 29083

Lowell Huff wrote:Acetic acid Stop Bath has no chemical reaction with developer that will result in white specs. Aluminum dropping out of fixer hardener because it is improperly mixed, results in white specs.
Skipping the stop bath causes the fixer to deteriorate quicker. It also causes the formation of specs.
by Ornello
Tue Jul 18, 2006 11:27 am
Forum: The Digitaltruth Forum
Topic: White Specs in Emulsion
Replies: 22
Views: 29083

Alkaline, neutral, or acid pH of fixer, other than processing time, maybe, and some personal preferences, there is no scientific data to support that one is better than the other. The biggest advantage of acid fixer is in machine processing. It is buffered against developer carry over and no stop b...
by Ornello
Tue Jul 18, 2006 10:18 am
Forum: The Digitaltruth Forum
Topic: Alternative developers for stand development
Replies: 31
Views: 51569

Ornello: I have been browsing thru some old copies of Darkroom Photography, and I came across an article by Steve Anchell, where he "discovered" the merits of vigorous agitation for, in this case, 4x5 film. I think this is about the time he started working on the BTZ tubes. Anyway, he sai...
by Ornello
Tue Jul 18, 2006 9:31 am
Forum: The Digitaltruth Forum
Topic: Alternative developers for stand development
Replies: 31
Views: 51569

Hi Jim. I don't know how this developer will work with Neopan 400, or how you'd like it. I don't like grain, myself, so I use other developers with fast 35mm films, but if you use Rodinal, and like its look with fast 35mm films, you'll probably like GSD-1 better. GSD-1 is similar to Rodinal, in tha...
by Ornello
Tue Jul 18, 2006 8:14 am
Forum: The Digitaltruth Forum
Topic: White Specs in Emulsion
Replies: 22
Views: 29083

Lowell Huff wrote:What is the chemical reaction that not using stop bath causes white specs?
I'm not sure, but I had the same problem. I went back to using stop bath and the specks disappeared.
by Ornello
Fri Jul 14, 2006 4:00 pm
Forum: The Digitaltruth Forum
Topic: Alternative developers for stand development
Replies: 31
Views: 51569

Thanks to you all for prompt responses. Jay, have found your answers to other peoples queries to always be quite straight - ahead, no bs. Would appreciate any guidance you can give. I do shoot medium format and and 35mm, Neopan 400 in both. (LF just doesn't suit my temperament). If your elixer woul...
by Ornello
Fri Jul 14, 2006 3:07 pm
Forum: The Digitaltruth Forum
Topic: White Specs in Emulsion
Replies: 22
Views: 29083

Lowell Huff wrote:If you are using a hardener, STOP. White spects usually is the aluminum dropping out of solution.
Nope, that's not it. It's the failure to use stop bath.
by Ornello
Fri Jul 14, 2006 3:06 pm
Forum: The Digitaltruth Forum
Topic: Alternative developers for stand development
Replies: 31
Views: 51569

Re: Wrong again

Ornello, Is that the best you can do? All developers will produce streaking if not agitated properly In the case of GSD-1, proper agitation consists of 1 minute initial agitation. It will usually deilute or acidify the developer, causing less development wherever it falls. Here you're just showing ...
by Ornello
Fri Jul 14, 2006 11:46 am
Forum: The Digitaltruth Forum
Topic: Alternative developers for stand development
Replies: 31
Views: 51569

Re: stand development

Orny, I know what horizontal means, and I know what causes bromide drag (that's the term you're looking for) in some developers when agiation is not adequate. That's not what we're talking about here. We're discussing developers that don't lead to bromide drag, and stand development in the vertical...
by Ornello
Mon Jul 10, 2006 2:12 pm
Forum: The Digitaltruth Forum
Topic: Alternative developers for stand development
Replies: 31
Views: 51569

Re: standing around

Ornello is wrong, sort of. The technique works best with sheet film in vertical tubes and an appropriate developer. Flat plates are no longer produced (I don't think), so that technique is obsolete, and the developer that works best for stand development produces more grain with rollfilm than some ...
by Ornello
Mon Jul 10, 2006 8:58 am
Forum: The Digitaltruth Forum
Topic: White Specs in Emulsion
Replies: 22
Views: 29083

Re: White Specs in Emulsion

has anyone experienced white specs on the emulsion side when processing black and white film? we are getting these specs that seem to be part of the emulsion (they won't come off). it's not consistent on every roll that we process nor is it consistent on a specific type of film. if anyone has any i...
by Ornello
Mon Jul 10, 2006 8:57 am
Forum: The Digitaltruth Forum
Topic: Alternative developers for stand development
Replies: 31
Views: 51569

Re: Alternative developers for stand development

Most advocates of this procedure recommend PC-tea, and other do-it-yourself formulae. Does anybody else use developers such as D-76/ID11, highly dilute Acufine, etc. I know Rodinal is also highly popular, but I have never had consistant success with it, so tend to avoid it. TIA Jim Stand developmen...