U of S | Mailing List Archive | alt-photo-process-l | RE: Mixing ferric oxalate

RE: Mixing ferric oxalate



John,

As Clay says, that's the amount to make 100 ml.

I've also had difficulty with recent batches taking one or more days to
fully dissolve. I just made a batch this week and left out the oxalic acid
and edta until after mixing the ferric and water for an hour or so. This
seemed to greatly speed up the dissolution process. It was completely
dissolved in one evening. It also seems to help to stir/shake for a minute
or 2, then let it sit for a while, rather than constant agitation

Kerik
www.kerik.com

 

> -----Original Message-----
> From: John Brewer [mailto:john@johnbrewerphotography.com] 
> Sent: Saturday, September 09, 2006 12:06 PM
> To: alt-photo-process-L@usask.ca
> Subject: Mixing ferric oxalate
> 
> Dear list
> 
> I'm mixing ferric oxalate solution from powder and it just 
> isn't going into solution. I used 27g ferric oxalate with 
> 4.8g oxalic acid and 2g EDTA (Na4). 
> I used hot distilled water to 50ml. I've been stirring for 
> 3/4 hour and I still have a yellow green opaque liquid and my 
> hand is about to fall off. Is it normal to take so long? Can 
> I reheat a little? Any tips/ideas?
> 
> Thanks
> 
> John.
> 
> www.johnbrewerphotography.com
> 
> Life shrinks or expands in proportion to one's courage. Ana´s Nin.
> 
> 
> 
> 
>