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

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

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

"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

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

"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.