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 Mon Sep 5 21:02:07 2005
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