Formula to Rapid Fixers?

And unless you are posting in the "What You Are Listening To" and referencing this title, using "Thick As A Brick" is out of order:
{An album I would heartily recommend, by the way}

Ben Hutcherson said:

I have not seen concentrated for ammonium thiosulphate solutions specified as %m/m or %m/v and yes that is a really important distinction.

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It is for analytical purposes; for making fixer, it doesn't really matter.

Ian Grant said:

If you don't understand the simplicity of a 60% weight to volume, then you are either grossly overthinking, or as Ian Anderson of Jethro Tull wrote "Thick as a Brick".

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That was uncalled for; please don't - although I assume the Jethro Tull reference was intended as a joke instead of an insult (and a good reason to look up some nice music).

Yes, apologies, it was intended as a joke.

However, I was also making a point that after I had clarified that the 60% Ammonium Thiosulphate solution is w/v (weight by volume), I also suggested that the misleading response was inaccurate, and "grossly over thinking the issue". A very quick Google search would have been enough to make this totally clear to the poster.

Ian Grant said:

It's 60% by weight, so 600g per litre.

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In photography, at a practical level, we never work in Molarity, so a Percentage solution is always weight by volume. Sure in Biology, Biochemistry etc Molarity is important, and I have reagents in Molar concentrations. I studied Biological Sciences at University.

But for non-scientists, which is most photographers, and factory workers mixing chemistry Molarity is way beyond their comprehension, and that is the reality, so sorry Ben, I meant you were over thinking.

Ian

@Mani_Reshad Here is a resource for chemicals used in the marine and oil industry that may be of assistance. They are based in Houston TX, USA and supply chemicals to our local industry here. https://unicleanamerica.com/united-arab-emirates/ Probably not ACS grade but who knows. The link is for their UAE office.