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> Sodium Thiosulphate identification. |
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#11
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With the water test I appear to have pentahydrate.
Not what the label reads on the container. Just a warning to anyone that has this on their shelf. http://www.film-and-darkroom-user.or...1&d=1622535184 http://www.film-and-darkroom-user.or...1&d=1622535184 Cheers.
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#12
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Correction....
For the test, put a teaspoon of the sodium thiosulphate into a small glass and add a small amount of water to dissolve it. Watch the temperature change on your thermometer. I missed a few words out in the original text. Cheers.
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#13
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That's disappointing, for a firm with Bellini's current reputation.
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#14
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Quote:
A small amount left in a tub from a Silverprint, did as said, rise in temperature, something I've never checked i.e. not known before, and yes it was labelled correctly as anhydrous. A more recent order states it's purity and use, including photographically, but nothing else. It is in a lovely crystal form so fits the description given by Nat and the Darkroom Cookbook, which also states that the temperature should noticeably lower. Probably because I only used a small amount, the temperature seemed to stay the same. My supplies are now marked, which will encourage me to look in the Darkroom Cookbook again when I use either of them, if my markings make no sense to me in the future. I love the way I still learn new things when reading posts on FADU. Terry S |
#15
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Well I can buy 25kg of Sodium Thioslphate Pentahydrate for £110, where as 2.5 kg Sodium Thiosulphate is £203 nearly 20x as expensive.
Someone has miss-labelled the Thiosulphate at Bellini. Ian |
#16
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Why all the fuss? some may wonder.
From my old Rayco formula booklet, Conversion rates. Sodium thiosulphate 100 ANHYDROUS = 160 PENTAHYDRATE (CRYSTAL) 62.5 ANHYDROUS = 100 PENTAHYDRATE (CRYSTAL) Important when mixing your own chemicals. Cheers.
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It will all be over by Christmas. |
#17
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I wrote an updated Formulae booklet for Rayco some years ago, later I tried to buy the business, it had been sold the day, before,it wasn't a company by then rather a side part of a Pharmacy and the shop owners wanted the space for something else. While it had already been sold but never traded again.
At one time in the dim and distant past almost all pharmacies/chemists shops here in the UK sold phot chemicals etc. Boots were the largerest and even had their own Wood and Brass cameras, Jessops and Jacobs where both Leicester pharmacists first before becoming photographic chain stores. I can remember in my youth buying film. paper and developer in a chemists shop in MAlvern, the gir gave me a special Universal developer to process my first 120 film - D163. Grain the sixe of bullets it wuld have been FP4, I had finer grain with FP3 in Promicrol, but hey you believed the selleer Ian |
#18
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Quote:
The labelling on my tubs doesn't specify either way, but the CAS number is different to yours. I've only just now opened one of the containers from an order placed last May. 2020, so it took five months to arrive from an hour up the road. I was more concerned with its stated expiry date of May 2021 than checking to see which type I had. Your original post, photographs, test and measurement conversions are all extremely helpful. Thank you. |
#19
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Thank you Molli and everyone else that helped.
Cheers.
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It will all be over by Christmas. |
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