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e.liska
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unknown dye - german label
Anyone can read and understand this? The powder has a dark brownish violet color.
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DraconicAcid
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Fellaucht grun? I know the last word means green....
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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e.liska
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I cannot google anything like this or similar.
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phlogiston
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Malachit grün maybe? It would match "MG". I can't make much sense of the first word on the label though. It doesn't look like any German word I know
and only resembles malachite a little bit.
[Edited on 29-9-2017 by phlogiston]
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"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer |
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e.liska
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But dry malachite green is green, isn't it? This looks more like violet.
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VSEPR_VOID
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Could you possibly make a solution of it for us?
Within cells interlinked
Within cells interlinked
Within cells interlinked
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e.liska
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The solution in tap water (pH about 7.5) is strong green. It takes very little powder to make a lot of color. Addition of baking soda does not change
the color. My vinegar is brown, but it does not seem to change the color either. What is strange, there is a very slight effervescence in plain tap
water.
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VSEPR_VOID
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You could send it off to be tested with some sort of spectrometer
Within cells interlinked
Within cells interlinked
Within cells interlinked
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e.liska
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Couldn´t the first three letters bee FCF? Not sure how to read the German handwriting.
Anyway, if I put the powder on a white surface and add some water in a way that the crystals are not immediately dissolved and tiny streams of colored
water forms around individual crystals or their small groups, it can be seen that there are some completely different, brownish-yellow streams of
water. So is it some mixture? Or is it possible that some crystals aged differently than others?
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Texium
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Hey, you may be onto something with the FCF. FCF Fast Green is a common dye, and the German name for it is FCF echtgrün!
If that's what they were trying to write though, they must have had really terrible handwriting.
[Edited on 9-30-2017 by zts16]
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e.liska
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So, the writing has been deciphered, it reads Sella Echt Grün GM, which is German for SELLA® Fast Green GM, which is some
commercial dye for leather. The only information I was able to google up is this file https://www.tfl.com/pdocs/PIN/SELLA_Fast_Green_GM_PIN_GLO_EN...
"SELLA® Fast Green GM is a mixture of direct and acid dyes imparting a neutral to slightly yellowish green shade (grass green). It is especially
suitable for green shades with very good fastness properties"
This explains the different colored crystals and maybe even the effervescence. But sadly I cannot google any detailed information about the chemical
composition.
[Edited on 30-9-2017 by e.liska]
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Morgan
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Contains no metals.
http://www.saceasrl.it/schede/dyes//Global_dyes.pdf
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gagepoon
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It's Malachite green which is one of the basic dye used as a dyestuff and controversially as an antimicrobial in aquaculture. Malachite green is
traditionally used as a dye for materials such as silk, leather, and paper. Sharing some sites to get more information on Malachite green dye.
En.wikipedia.org/wiki/Malachite_green
Dyespigments.net/basic-dyes-manufacturer-supplier-exporter-india.html
Ezinearticles.com/?Malachite---Mother-Natures-Finest&id=7487749
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e.liska
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What is your source? It does not look like a malachite green to me. Anyway, your link to the malachite mineral article is plainly wrong, because
malachite green is not the same chemical as malachite mineral is.
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e.liska
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What we know so far:
- it is a mixture of at least two different dyes
- it does not contain metal
- its color is not dependent on pH in the vinegar to baking soda range
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ZeLaboratorium
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Add some stronger acids/bases
malachit green changes color at an Ph of 1.8 or 11.5 (wikipedia)
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aga
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"unknown dye" is basically what the label says.
Basically their spelling was poor - it should read "vielleicht grün MG" which translates nicely.
(how they spelt the word was phonetically very close)
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e.liska
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No, it is already deciphered as Sella Echt Grün GM (SELLA® Fast Green GM) - commercial dye of unknown composition.
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unionised
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So far, we seem to have clearly established that we don't know, with any certainty, what the stuff is.
Kudos (and welcome) to ZeLabatorium for actually proposing something that might help to find out.
e.liska,
do you have access to any stronger acids or bases?
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e.liska
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I have common household NaOH (granulate), but no strong acids. I have basically only a kitchen "lab".
[Edited on 4-10-2017 by e.liska]
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unionised
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Well, malachite green goes clear in sodium hydroxide solution.
If you can get some hydrochloric acid - sometimes sold as a cleaner for patios/ decking- you might be able to get it to turn yellow.
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aga
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Quote: Originally posted by e.liska  | | No, it is already deciphered as Sella Echt Grün GM (SELLA® Fast Green GM) - commercial dye of unknown composition. |
Say out loud what is written on that label in German, then try to work out what those sounds mean.
All Written language (apart from Maths and a few others) are a way to record audible noises that convey information.
I could easily be wrong, of course, and a single solution is always easier to deal with.
Hopefully you'll find something useful to do with the substance.
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DraconicAcid
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You could try paper chromatography on it to see if it really is a mixture.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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e.liska
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When I add several granules of NaOH to few milliliters of the green solution, the solution heats a lot (dissolving NaOH) but color does not change too
much. I think the base does not change at all, but the solution looks differently because lots of small particles precipitate in it, so what I get is
suspension of darker particles in green solution.
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SWIM
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Since it is a mixture of direct and acid dyes, maybe they can be partitioned to some extent with the right solvents.
Wouldn't the direct dyes be likely to have more affinity for some organic solvents than the acid dyes?
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