Re: Color prints - RA4 or Infochrome

"Mike" <mike@xxxxxxxxxxx> wrote in message
news:pan.2005.08.17.20.25.39.184452@xxxxxxxxxxxxxx
> Start by going with easy and somewhat cheap: Tetenal Mono RA-4 room
> temperature process
>
> You can even use trays, but I recommend you pick up a cheap paper
> processing drum.
>
> RA4 paper is far cheaper than Ilfochrome. The Tetenal room temperature
> chemicals aren't all that cheap, but not too bad. And you will not have
> to deal with the contrast problems of Ilfochrome.

Thank you everybody for good advice. I noticed Ilfochrome material is quite
a bit more expensive, but I previously thought RA4 would require temperature
controlled processing, i.e. ~~ 40 degC 104 degF conditions. I did not even
know room temperature chemicals exist for that. I thought I would need to
choose between easier processing vs. material cost.

I think this clarified the situation completely for me. I will try the
Tetenal kit - most likely already quite soon, since no additional equipment
purchases are necessarily required. I think I would like to have a
processing drum at some point, too, but it is good that I won't need a very
expensive temperature controlled one.

I could not find any online information about this Tetenal room temp
processing, so I wonder if anybody could clarify the following questions
that came into my mind, before I buy the kit.

What is the processing temperature then more accurately (20 degC = 68 degF,
24 degC = 75 degF?) and allowed tolerance regarding that? Can I compensate
temperature offsets with processing time as can be done in B&W processing?

How many processing steps/chemicals are required - how many trays do I need?

Do the chemicals come as powder or concentrate? For how long can I expect
the working solutions to remain usable when stored? I think I won't be doing
this so often - or very many prints at a time. Maybe something like max. 5
to 10 prints at a time, twice a month or so for starters.

How about the final rinse/wash of the prints - can I expect about the same r
equirements/time as with B&W RC paper?

.

Relevant Pages

  • Re: LM34 to A/D
    ... I don't, and will never, trust averaging an acquisition synchronized to ... always software lowpass filter stuff like this, ... temperature acquired by a fast sampling ADC. ... the cheap gain amp, which can be calibrated with a cheap voltage input. ...
    (sci.electronics.design)
  • Re: LM34 to A/D
    ... the cheap gain amp, which can be calibrated with a cheap voltage input. ... He can calibrate based on a temperature standard, ... He can use E96 metal film resistors for his gain and bias setup of the gain amp and calibrate those errors with a simple voltage input. ...
    (sci.electronics.design)
  • One U.S. state is creating more carbon emissions than nearly every nation in the world=Texas
    ... They want to make cheap electricity. ... A cheap home heating is achieved by regulating the operating ... temperature there is always an optimal set heating product, ...
    (sci.astro)
  • Re: Cold, hard facts defy the doomsayers
    ... That ozone is affected by chemicals has always been clear. ... Because we've kept daily temperature records here since the mid-1800s. ... How does that correlate to global warming? ...
    (sci.geo.geology)
  • Re: Origins and Mental Activity
    ... reactions occur regardless of the composition, pressure and temperature. ... All the above refers to reactions under equilibrium conditions. ... the set of chemicals you have depends not only on the elemental ... at other times a collision will break up an existing molecule, ...
    (talk.origins)