From: Clay Harmon (wcharmon@wt.net)
Date: 08/21/02-03:30:43 PM Z
My experience concurs with Sandy's. I had a bottle mixed last January that I
just recently finished. The results at the end of the bottle seemed to be
the same as at the beginning. Unlike tequila...
Clay
on 8/21/02 4:25 PM, Sandy King at sanking@clemson.edu wrote:
> Julian wrote:
>
>
>
>
>> Hi,
>> one thing I have noticed when doing a batch of VDB prints, is that if I mix
>> all three solutions together to make a single working solution it just
>> doesn't last. It seems to go off (oxidise?) and makes producing a decent
>> print impossible even the next day.
>> I tracked the problem down to the tartaric acid, having found that the other
>> two solutions will keep well for months in dark brown bottles. The tartaric
>> acid solution will not work even the next day. I figure the cost of the
>> tartaric acid to be almost negligible and therefore mix this fresh before
>> any printing batch- a bit of a pain, but I always get a decent result.
>>
>> The f.A.citrate, btw , will always generate a certain amount of sludge on
>> storage. I have found this to be harmless to my prints as long as it is not
>> disturbed in the bottom of the bottle..
>>
>> All the best,
>>
>> Julian.
>
>
> Very curious. I have not found that the combined solution goes bad,
> even after many months. Just a few days ago I finished a large bottle
> of the combined A, B, and C solution that was mixed in January or
> February of this year and the results at the end seemed as good as
> what I saw at the beginning of the year.
>
> Sandy King
>
>
>
>
>
>>
>>
>>
>>
>>
>>
>> ----- Original Message -----
>> From: "Don Bryant" <dsbryant@mindspring.com>
>> To: <alt-photo-process-l@sask.usask.ca>
>> Sent: Wednesday, August 21, 2002 12:15 PM
>> Subject: Re: Van Dyke Brown Mixing question
>>
>>
>>> ----- Original Message -----
>>>
>>>>
>>>> Don:
>>>>
>>>> I went through this same problem with the list a few months ago, and
>>>> subsequently have mixed in part C very slowly as per the advice I
>>> received.
>>>> The batch I made last Sunday was pretty much clear by Monday evening,
>> with
>>>> just a little sludge. Yours will probably be fine tomorrow.
>>>>
>>>
>>> Thanks Clay, I'll keep an eye on it.
>>>
>>> Don Bryant
>>>
>>>
>>>
>
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