Re: Ferric Oxalate Questions

Thanks a lot for all the help everyone

Michael...are there any other additives in the Grotek Super Oxy?

Has anyone been able to determine the concentration of those other grades
you can buy at a beauty parlour?

Bill, my primary reason for the higher concentration of H202 isn¹t for
sensitizer (though I was curious as to which concentration of H202 one does
add to sensitizer ­ 3% thx). I¹m getting the higher conc. stuff to convert
the Ferrous I have to Ferric. I¹ve figured out that 6% is the best for what
I¹m planning, so I might try increasing the concentration of the 3% I have.
Or go to the beauty parlor.

K, I don¹t want everyone to assume I¹m a fetid, troll-like being...but what
exactly is a beauty parlor? There is a hair salon across the street, and a
spa ­ do these pass as beauty parlors?

Can anyone chime in on q¹s 2,3 and 4? (For example, if a 13.5% solution was
used instead of 27% - same drop count ­ what would the result be)?

Regards,
Gu

On 7/16/06 11:07 PM, "Michael Koch-Schulte" <mkochsch@shaw.ca> wrote:

> Gu, if you want to try a higher concentration of Hydrogen Peroxide go the the
> local "grow op" store. You should be able to pick up a litre of "Grotek Super
> Oxy" for about $9 CDN. 35% concentration H2O2. Just be very careful with it.
> Spills will ignite things.
>
> ~m
>>
>> ----- Original Message -----
>>
>> From: G Guhan Gunaratnam <mailto:guruguhan@hotmail.com>
>>
>> To: alt-photo-process-l@usask.ca
>>
>> Sent: Sunday, July 16, 2006 12:32 PM
>>
>> Subject: Ferric Oxalate Questions
>>
>>
>> Hello,
>>
>> I was hoping someone could help with some questions I have regarding FO I
>> have ended up with a large amount of Ferrous Oxalate, I have placed an order
>> for Ferric, but have been playing around with what I have in the meantime.
>> I have made some ferric from oxalic acid, ferrous oxalate, and hydrogen
>> peroxide. I didn¹t have strong H202 to work with, and had to use it in a 3%
>> concentration. The solution now passes the Potassium Ferricyanide test, but
>> I¹m unsure of the concentration and a few other things.
>>
>>
>> 1. If you have an FO solution just sitting in front of you, is there a way
>> to determine its concentration?
>> 2. Is 27% solution used because it simplifies the mixing process (1:1 with
>> metal salts)?
>> 3. would a weaker FO solution cause any significant problems apart from
>> complicating the ratio with metal salts?
>> 4. if the ratio of metal salts to ferric is not correct (too little ferric),
>> what would the result be? - lower density due to the salts being washed
>> away? - what is the price of using too much ferric (harder to clear)?
>> 5. For those of you who add a drop or so of H202 to your sensitizer...what
>> concentration do you use?
>>
>> To properly get the concentration of the FO I¹ve got, I¹ll redo my steps.
>> First time I just wanted to see if I could get the Ferric with such a weak
>> solution of peroxide.
>>
>> Thanks in advance,
>> Gu
>>
>>
>
Received on 07/17/06-02:07:45 PM Z