vmelkon
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Anyone have this salter science chemistry kit
http://www.nationaltrustcollections.org.uk/object/662097
There is a certain chemical that is basically a dye. I'm not sure what it was used for. Maybe it was used as a acid-base indicator?
The tube says C27H31N2NaO6S2 on it and Sky Blue Dye (Bleu du Ciel). The tube number is 36.
I did some web search and looks like this chemical has a few hundred other names such as Sulfan Blue.
Anyway, I can't remember why this chemical was included in the kit. I haven't used it.
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confused
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www.grrexports.com/Products/Acid-Blue-1.html
says
"Determination of the anionic and cationic contain"
so im guessing either pH indicator or redox indicator
apparently it's also used as a histology stain according to sima aldrich
http://www.sigmaaldrich.com/catalog/product/sial/198218?lang...
you could do a few tests to check, make a solution from a small sample and do some tests on it
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BlackDragon2712
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found this, don't know if it is of any help!
http://www.chemspider.com/Chemical-Structure.8193.html
also
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&a...
so it seems that it also have some applications in medicine as well
[edited]
"Patent blue-VF is a dark bluish synthetic dye used as a food coloring and food additive. "
http://www.allergeaze.com/PDFs/FA/FA191.pdf
[Edited on 06/11/2013 by BlackDragon2712]
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Ascaridole
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Your guess of a redox indicator is a good one. A quick visit to sigma aldrich pulled up leuco patent blue violet
http://www.sigmaaldrich.com/catalog/product/sial/l1275?lang=...
In the description it notes the dye is in its reduced form. The wikipedia page shows an oxidized form. The sad part is theres no listing of its redox
potential so some digging into older chemistry texts is needed.
Also it appears the oxidized form of this dye can be used as a pH indicator. Perhaps this was a "kill two birds with one stone" reagent for your kit.
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watson.fawkes
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Does anybody have the original manual for this
set, or perhaps a scanned copy of it? http://keeline.com/chem/ has a number of old such manuals, but not for this brand.
<hr>bfesser moderator expellendus est
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fez
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The chemistry set pictured in the link looks like a later version (I'm guessing mid 80s from the use of TV science presenter Johnny Ball's
endorsement) of the one I had as a child in the very early 80s. I don't have the set anymore but I do remember 'sky blue'. It came in the form of
small crystals, like a paler more translucent copper sulphate.
It was used as an indicator, acid/base unless I'm much mistaken - surely redox would have been too advanced a concept for the target audience. I
didn't understand at the time, and neither did my science teacher, why two separate indicators were included in the kit (methyl orange for acid pH and
sky blue for alkaline). I'm fairly sure the colour change was from blue to green.
Sorry I can't be of more help, but thanks for stirring up some childhood memories!
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vmelkon
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Oh, now I finally understand what the black round thing is in the link I posted.
http://www.nationaltrustcollections.org.uk/object/662097
It is a record!
The version I had received as a gift had a audio cassette instead (late 80's). Yes, with Johnny Ball. I remember him saying things like if ice was
less dense than water, it would sink. The oceans and seas would be frozen. Then something about getting some popsicle out of the freezer, sucking it
to remove the flavor.
Quote: Originally posted by fez  | The chemistry set pictured in the link looks like a later version (I'm guessing mid 80s from the use of TV science presenter Johnny Ball's
endorsement) of the one I had as a child in the very early 80s. I don't have the set anymore but I do remember 'sky blue'. It came in the form of
small crystals, like a paler more translucent copper sulphate.
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The Sky Blue Dye is actually very dark blue. Much darker than copper sulfate.
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