Re: report on cynotype and acid and a chemistry question.

Thank you Carmen,

It seems my question was a bit unclear. I meant the actual recipe. Am I
to understand that you use these amounts of solutions containing
"standard" concentrations of the two chemicals (i.e. something in the
order of ~25% ferriammoniumcitrate and ~12.5% potassiumferricyanide in
the stock solutions)?

If I have understood this correctly, my next question is: Why are you
doubling the amount of ferriammoniumcitrate?

Tom Einar

Carmen Lizardo wrote:
> Tom, I used 20ml of ferric ammonium citrate solution,
> 10ml of potassium ferric cyanide and 5 ml of citric
> acid.
> I diluted 40 grams of citric acid in 100ml of
> distilled water.
>
> Carmen
>
>
>
> --- "T. E. Andersen" <postlister@microscopica.com>
> wrote:
>
>
>>Hello Carmen,
>>
>>Thank you for the information on using citric acid
>>in the cyanotype
>>sensitizer.
>>The information you give about your recipe puzzles
>>me a bit. Could you
>>please post your actual recipe? The one I've always
>>used, as well as all
>>other that I have checked, use a 1:1 ratio of the
>>two component
>>solutions. This implies that you may have a
>>significantly different
>>recipe from what I'm used to.
>>
>>Also,- when you say 25% citric acid, what do you
>>mean? Is it 25% of the
>>total volume? 25% by weight of citric acid in the
>>final solution?
>>
>>Thanks again, and have a fine day!
>>
>>Best regards,
>>Tom Einar Andersen
>>
>>
>>
>>Carmen Lizardo wrote:
>>
>>>I used the classic formula, mixed 2a: 1b and added
>>
>>25
>>
>>>percent of citric acid (Of a 40 percent solution
>>
>>of
>>
>>>citric acid mixed with distilled water).
>>
>
>
>
>
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Received on Wed Oct 26 07:32:45 2005