Developing, HELP!!!!

[Photo Engineer]

I think RC paper has a developer incorporated into the emulsion which allows development to completion in one minute, while FB paper does not have a DI surface.

This is not restricted to RC. Any paper may have ID, and can be tested with the method I have given previously here on APUG.

PE

 

[Ed Sukach]

I think RC paper has a developer incorporated into the emulsion which allows development to completion in one minute, while FB paper does not have a DI surface.

Some manufacturers flagged the developer-incorporated paper by adding the word "Rapid" to the name, e.g., "Ilford MG RC RAPID".

These papers were intended for use in a machine and process with which I am not familiar - and CAN be used in conventional processing. I've used "Rapid" papers - and not been especially satisfied with the results.

 

[Photo Engineer]

Ed is correct.

What is surprising is that many manufacturers do not put this label on, or deny that there are incorporated developers, but when you fog a piece of the paper in question, and then put on a drop of alkali, the paper develops.

PE

 

[Tom Hoskinson]

Then there are developers such as Ansco 130 which some use for paper (1+1) and some for film at higher dilution (1+5 IIRC). I've no idea how well it works for film as I've not tried it but I'm sure there are people here who have - I recall reading about it.

But yes, it is all getting a bit confusing... In general use film developer for film and paper developer for paper unless you know what you are doing (unlike me)...

Cheers, Bob.

P.S. I'd love to know what puts the "Multigrade" in "Multigrade Developer" too - or this the same sort of thing as we see with: "digital tripod" ...

Bob, I've used Ansco 130 diluted 10:1 to develop 35mm TMax-100 (with excellent results).

 

[dancqu]

I think RC paper has a developer incorporated into
the emulsion which allows development to completion
in one minute, while FB paper does not have a DI surface.

There is no reason to "think" RC or any other paper has
an emulsion with DI when it is too damn easy to KNOW
one way or another.

With lights on immerse a piece of the paper in nothing
more than a weak solution of carbonated water. If there
is DI the paper will darken and if enough to develope
fully, the paper will blacken.

Sodium carbonate, washing soda is a most common
developer activator. It working alone is even more so
an activator.

A few years ago Freestyle assured me that NONE of
their Graded papers had DI emulsions. Since then their
line-up has changed. One Graded paper they did add and
does have some DI is Arista EDU.Ultra although it also
needs a usual development.

I've tested about half dozen popular FB papers, Graded
and VC, and found none with DI emulsions. I think there
may be some confusion. Some papers do claim to have
DI Super Coats; an extremely thin over the emulsion
protective film. The purpose of it having DI, your
guess is as good as mine.

RC papers are another matter as the paper was many
years ago brought to the market for machine processing;
activator processors. Likely few today in sheet form are
of the RAPID type. Dan

 

[Photo Engineer]

Dan;

Some DI activators are Sodium or Potassium Hydroxide at high pH and therefore may not reveal the DI. Even if it is not revealed, it is there and has a reductive effect that can gradually affect the keeping qualties of a given paper. It is therefore necessary to fully test with higher pH than carbonate IMHO.

PE

 

[richard ide]

PE
When I started in 1980 someone gave me about 800 sheets of Agfa Rapidoprint film and a couple of cases of activator. Maximum density in .001 seconds and then my hands started to burn. Gloves cured that but really corrosive.