Hi everyone,
I have a very dumb question I think. I browsed the forums a bit for the answer but it seems nobody is as dumb as I am !
I've recently started to do pyro processing with Tanol with some success.
But I encounter a problem with the sodium sulfite solution.
I use anhydrous sodium sulfite and I dilute 10g in 1L water for that 1% solution at the end of the pyro process.
And I have big troubles actually diluting the sodium sulfite completely.
It seems to always have residues of undiluted crystals in the solution no matter what I tried :
Dilute in cold water, in hot water, dilute it in a small volume then add more water, dilute in the full volume from the start, trying to give it time, sometimes almost 48h with agitation every couple of hours, etc...
And it is pretty annoying because the crystals of course kinda stick on the film. So much that even after extensive washing, some residues will still be found on the surface of the film.
The very awkward solution I have adopted so far is to do a last wash under the sink as you would wash a plate, gently brushing both film surfaces with my hand, to remove the crystal residues.
I am obviously doing something wrong about that sodium sulfite solution and dilution, and I'd really like to read more experienced users about that !
It would help me a lot.
Last piece of information that might have some impact on dilution (I don't know), the water I have at disposal is rather hard, if not very hard. Would that be an obstacle to proper sodium sulfite dilution ?
Thank you in advance !
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