Keeping solutions of KBr and Benzotriazole

[Jarin Blaschke]

Hi all:

Do I need to add any Sodium Sulfite or other preservative to a bottle of 10% Potassium Bromide and a bottle of 1% Benzotriazole that I'm making up today? Or just restrainer and water only? How long can I expect these to be reliable? -years?

Thanks!

-Jarin

 

[Photo Engineer]

Nothing need be added. They both keep well for a year or so. Use distilled water.

PE

 

[Jarin Blaschke]

Thanks!

 

[Jarin Blaschke]

In solid form, how long do Benzo. and KBr last? I have Benzotriazole I bought in May 2015.

 

[Photo Engineer]

Benzotriazole is fine, and KBr will keep for years as well. As long as both are free flowing, you are fine.

PE

 

[Jarin Blaschke]

Thanks. Free flowing?

 

[Photo Engineer]

Yes, not clumped or brownish. Free flowing crystals or powder that are both white or just slightly off white.

PE

 

[Pat Erson]

They both keep well for a year or so. Use distilled water.

PE

Only one year PE? I intended to use some Benzo I diluted years ago (in alcohol...). Me worried now.

 

[Ian Grant]

Only one year PE? I intended to use some Benzo I diluted years ago (in alcohol...). Me worried now.

Both keep years, Benzotriazole should be in a Sodium Carbonate solution. 10g Benzotriazole, 10g Sodium Carbonate, water (distilled or de-ionised) to 1 litre.

Ian

 

[Pat Erson]

Thx Ian!
"a Sodium Carbonate solution"? Whoops... I foolishly "dumped" 100g of Benzo in a liter of alcohol. Live and learn.

 

[bernard_L]

I have my benzotriazole as a 1% solution in diethylene glycol. Made up 3 years ago. Can I expect it to be still OK? How should I check?

 

[Jarin Blaschke]

My KBr is white, but includes some giant crystals, some 3/4" long. Presumably ok? The Benzo is still like cotton.

 

[Photo Engineer]

Thx Ian!
"a Sodium Carbonate solution"? Whoops... I foolishly "dumped" 100g of Benzo in a liter of alcohol. Live and learn.

See my post above. I said YEARS! And you don't need Sodium Carbonate. Alcohol will do!

PE

 

[Pat Erson]

you don't need Sodium Carbonate. Alcohol will do!

PE

Whoa one of my darkroom practices has been sanctioned by the one and only PE.
I feel like I've won the Hasselblad prize! (minus the 150K $ donation though...)

 

[Ian Grant]

Thx Ian!
"a Sodium Carbonate solution"? Whoops... I foolishly "dumped" 100g of Benzo in a liter of alcohol. Live and learn.

Ilford sold Benzotriazole solution - Ilford IBT Restrainer, 10g Benzotriazole in a 1% Sodium Carbonate solution. There's nothing wrong with dissolving in alcohol, it's not particularly soluable in water only 20g/l @ 20ºC.

Ian

 

[Gerald C Koch]

At one time Kodak sold BZT as little tablets the size of baby aspirin. On the bottle was a chart indicating how may tablets to use per quart. ! tablet for developers like Microdol and two tablets for more active developers like D-72. Very handy as no measuring was required.

 

[Jim Noel]

At one time Kodak sold BZT as little tablets the size of baby aspirin. On the bottle was a chart indicating how may tablets to use per quart. ! tablet for developers like Microdol and two tablets for more active developers like D-72. Very handy as no measuring was required.

The tablets must keep forever.I have a couple of bottles I obtained in the 50's and they still work perfectly.