Kai,
Just how much oxalic is added per ml of emulsion? and by how much is
the exposure reduced due to increased light-sensitivity?
TIA, Rajul
On 7-Apr-06, at 7:02 AM, Kai Hamann wrote:
> Hello Michael,
>
>> What's the idea behind some recipes adding a pinch of oxalic acid to
>> traditional A:B cyanotype? Change of colour? Speed? <
> The oxalic acid makes the mixture more light sensitive and prevents
> blue staining of the highlights.
>
> All the best
> Kai
>
>
Received on Fri Apr 7 09:03:46 2006
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