[alt-photo] Re: Subject: Re: paper and cyanotype

[Loris Medici]

Dear Christina,

Could be that the particular batch you had wasn't fresh (can explain
the staining on Buxton?), plus, maybe it contains a little more
dichromate than the barely minimum (can explain the slow speed). It's
best to mix it yourself, it's not that hard; just be sure to let the
solution crystallize well (at room temperature) and filter it
thoroughly (I use two layers of coffee filters).

Try the oxalic acid anyway, may work for you. There are a lot of
people who are working with it w/o issues... (Not everybody is fond of
/ willing to work with HCl!)

Regards,
Loris.


23 Şubat 2012 18:34 tarihinde Christina Anderson <zphoto at montana.net> yazdı:
> Dear Loris,
> In corresponding with Ware I think my clearing issue, especially on Buxton, indicates possible problem chemistry. Thus I will have to buy a new batch and mix it from scratch. And here I thought buying it readymade might be better quality control but I think not :(
>
> Traditional curve is a bit flatter but follows same what I call shorter scale curve. But now I am rethinking my Ware's results until I get the new chems.
>
> Nice to hear about your "bust" with oxalic and FAEW. Saves me a step!
> Chris