Re: cyanotype soln. gone bad

Correction!

I add HCHO to BOTH A and B solutions. Loris, it is interesting that
you do not add it to B and you have a color run. Perhaps, adding it to
B might might account for my observation of color conservation at
development.

Rajul

On 6-Sep-05, at 12:38 AM, Loris Medici wrote:

> That's a huge amnt. of formaldehyde! I use 15 drops per 1000ml of stock
> solution A (I use it only in stock solution A, I don't add it to B).
> Still no fungus in 25 months old solution. But I have color running off
> in developing water (no big problem - it doesn't stain the highlights
> and I have calibrated my exposure/negatives according to this).
>
> Regards,
> Loris.
>
> -----Original Message-----
> From: Venkatram Iyer [mailto:eyeear@telus.net]
> Sent: 06 Eylül 2005 Salı 06:02
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: cyanotype soln. gone bad
>
>
> Joe,Judy,
>
> I do not know the concentration of the formaldehyde (HCHO) but I get
> it from the local pharmacy. 2-3 drops per 12.5 ml of each of A or B
> solutions prepared a la James does the trick.
>
> Do let me know if you too find that there is little run of the blue on
> development. Rajul
>
>
> On 5-Sep-05, at 7:18 PM, Joe Smigiel wrote:
>
>> Good tip Rajul but could you please be more specific? Is this 2-3
>> drops
>> of 37% formalin per liter of stock A and stock B, or is it some other
>> concentration and volume?
>>
>> Thanks for any additional info.
>>
>> Joe
>>
>>>>> eyeear@telus.net 09/05/05 12:04 PM >>>
>> I add 2-3 drops of formaldehyde to each of the 2 solutions (stored in
>> amber colored bottles) used in traditional cyanotype printing and
>> store them at 4C in the fridge. This prevents fungus from growing in
>> the stock solutions. Prints made using formaldehyde-fortified
>> solutions do not run color at development in either plain water or in
>> diluted vinegar.
>>
>> Rajul
>>
>>
>
>
Received on Tue Sep 6 09:06:58 2005