Ilford Bromophen 5L Stock

[Filmic1]

I'm a research technician, so as practice, this is a FAUX PAS...... however

I bought the two package/part set of Ilford Bromophen to make 5L stock. Water has to be 50ºC for Part A

This Falcon Chem carboy I have comes shy of 5L and that's almost overflowing. I'm guessing this is a 4L carboy. Missing 20ml to bring to actual 5L strength as per instructions.

Those in the know. Is missing this 20cc of solvent going to compromise the final working concentration?

I'm retired so I don't have lab access any longer and certainly don't have a fume hood. Thanks!!

(Yes, I tossed that old Ilford paper developer.)

 

[pentaxuser]

As it has to be diluted further at 1+3 before use then I'd have thought that making it into 4,980 cc instead of 5L would make so little difference as to be inconsequential All you will have is a developer that is very marginally stronger than was intended

pentaxuser

 

[koraks]

Is missing this 20cc of solvent going to compromise the final working concentration?

Nope.

don't have a fume hood

You really don't need one for this.

 

[MattKing]

To be clear, do I understand you to be saying that all the powder is mixed in, but you are just short of the suggested volume of the water used to mix it into the stock solution?
Your use of "solvent" is what made me wonder - I would have probably used just "water" .
Assuming my understanding is correct, as posted above you have nothing to worry about.
And you really don't need to use extreme methods to use and make up commercially available powdered photo chemicals. A reasonably well ventilated room and normal care are fine.

 

[Filmic1]

To be clear, do I understand you to be saying that all the powder is mixed in, but you are just short of the suggested volume of the water used to mix it into the stock solution?
Your use of "solvent" is what made me wonder - I would have probably used just "water" .
Assuming my understanding is correct, as posted above you have nothing to worry about.
And you really don't need to use extreme methods to use and make up commercially available powdered photo chemicals. A reasonably well ventilated room and normal care are fine.

Thanks, for all the responses.

Working in labs makes one twitchy when it comes to making solutions. Especially the stuff I've been exposed to. Ta!

 

[MattKing]

Thanks, for all the responses.

Working in labs makes one twitchy when it comes to making solutions. Especially the stuff I've been exposed to. Ta!

Understood.
But it is appropriate to also understand that one of the design requirements for the main suppliers of small volume photo chemicals is that the product be easily and safely handled by people who lack the resources and experience of lab employees.

 

[Filmic1]

Understood.
But it is appropriate to also understand that one of the design requirements for the main suppliers of small volume photo chemicals is that the product be easily and safely handled by people who lack the resources and experience of lab employees.

Good point!

Yeah, I just snipped off one end corner of the envelopes so the powder had less of a chance of aerosoling on pouring.

Finished and negligible spillage. Thanks for the great feedback.

 

[MattKing]

With some envelopes, you can follow the snip by immersing that corner into water which allows the water to enter the envelope to start the mixing process, and then pour the resulting slurry into your mixing container. And you can then further rinse the envelope with more water.

 

[Filmic1]

With some envelopes, you can follow the snip by immersing that corner into water which allows the water to enter the envelope to start the mixing process, and then pour the resulting slurry into your mixing container. And you can then further rinse the envelope with more water.

Great idea!

I rinsed the empty envelopes out with water. The corner cut made that safe. I noticed how the powder slurried, as little left as there was.