Re: Cyanotype

Cool, Michael.
Did you see any graininess or white spots in the 40% coat? What makes the
40% coat harder to coat?
Is there any way you could post a jpg of the comparison of dmax of the
three? Or do you have a reflection densitometer to measure the differences?

It seems you are saying that the only benefit to the 20% 2:1 is speed...
Chris
----- Original Message -----
From: "Michael Koch-Schulte" <mkochsch@shaw.ca>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, February 15, 2006 11:14 PM
Subject: Re: Cyanotype

>I mixed up the 40% and tried it:
>
> Single coats:
> 40% "A" 1:1 Had best dmax, similar to double coating 20%.1:1 Needs a
> defter
> touch when coating. Definately could cause problems if overcoated. Not for
> wimps.
> 20% "A" 1:1 Still had a deep blue, not as deep. Same number speed as
> above.
> 20% "A" 2:1 Lightest dmax but acceptable, Faster by about a stop though.
>
> ~m
>
>
>
>> Question: which leads back to Michael, I think, who asked instead of
> using
>> 20% FAC 2 parts to 8% potassium ferricyanide 1 part, why not mix a 40%
>> solution of FAC and then use that 1:1 with an 8% solution of potassium
>> ferricyanide...I wondered if mixing it up that heavily would lead to
>> undissolved FAC in solution, if there is a point where FAC falls out of
>> suspension....and then might lead to graininess or some such thing. You
> say,
>> below, you get crystallization on the paper--do you mean white spots,
> actual
>> crystals, graininess, etc??? Short of just mixing up a 40% and trying it
>> myself, which I might do, I'm just wondering if graininess that people
>> complain about with the traditional formula has to do with too much
> FAC...OR
>> even, if the amount of FAC doesn't even matter that much as one person
>> has
>> suggested.
>>
>
>
Received on Thu Feb 16 08:19:53 2006