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#1
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Divided D76 precipitate
I've just had my Formulary dD76 mixed for a week. Sol A has a dirty,
brownish, snowflake sized precipitate in it. Has anyone else seen this? Is it normal or what? -Lew |
#2
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Divided D76 precipitate
Lew wrote:
I've just had my Formulary dD76 mixed for a week. Sol A has a dirty, brownish, snowflake sized precipitate in it. Has anyone else seen this? Is it normal or what? Did you use tap water? Martin |
#3
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Divided D76 precipitate
Yes, but here in Brooklyn, NY the tap water is exceptional & I've never had
any problems over the years with a wide variety of chemistries. -Lew |
#4
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Divided D76 precipitate
"Lew" wrote
I've just had my Formulary dD76 mixed for a week. Sol A has a dirty, brownish, snowflake sized precipitate in it. Has anyone else seen this? Is it normal or what? Speaking of ALL photographic solutions, I can not think of ONE instance in which particulate matter is a contributing ingredient in the working solution. With repeated use some solutions do generate a little sludge. Divided D76 should have no precipitate, A or B. Just a thought; how much film got "mixed" into part A? Dan |
#5
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Divided D76 precipitate
Dan:
You're right, I really don't know whether it's precipitate or not. The solution was clear while unused. After 2 rolls of film the gunk appeared. I filtered a quantity to use today and the results look fine. Still like to know what's happening, though. -Lew |
#6
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Divided D76 precipitate
"Lew" wrote in message ...
Dan: You're right, I really don't know whether it's precipitate or not. The solution was clear while unused. After 2 rolls of film the gunk appeared. I filtered a quantity to use today and the results look fine. Still like to know what's happening, though. -Lew As Martin suggested, this is what normally happens when using the published formula of D76 or the alike made up with tap-water. First they are clear, after developing a roll or two you get some precipitate in the solution. I'm using Barry-Thorntons Two-bath (a metol/borate formula) this way with no ill-effects so far but this may depend on the rest of the processing conditions. Therefore, I would recommend to use distilled water to make stock as well as working solutions that do not contain any sequestering agents. |
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