[alt-photo] Re: dilution of pt/pd

[Loris Medici]

Yes, exactly. The alkali (Na4) vs acid (Na2) stuff made me say "hmmmm"
too... Thanks.

Regards,
Loris.

2010/7/24 Clay Harmon Website <clayh at clayharmon.com>:
> I just use the tetrasodium variety out of habit. I wonder if using the disodium variety would beneficial? I know it is acidic versus the slightly basic tetrasodium version. hmmmm
>
>
> Clay
> On Jul 24, 2010, at 6:35 AM, Loris Medici wrote:
>
>> Clay which EDTA is that? I presume Na2EDTA... Right?
>>
>> 2010/7/24 Clay Harmon Website <clayh at clayharmon.com>:
>>> Mark, adding oxalic acid to the FO will shorten the exposure time. I tested this years ago, and it is increases the light sensitivity of
>>> the coating solution. And slightly increases its exposure scale. And makes it easier to clear. No downside to adding it that I was
>>> ever able to detect. My formula is 27g FO, 4g oxalic acid, 2g EDTA to make 100ml. I think this is a pretty standard mix.