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woelen
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The sodium salt does dissolve quite well though. So, I can imagine, that is you add a copper(II) solution to a solution of a sodium fluorescein salt
solution, that a precipitate is formed. I have strong doubts on its fluorescence though, but it would be a nice experiment. One has to be careful then
using a slight excess of fluorescein with respect to NaOH, otherwise you just make impure copper(II) hydroxide.
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indigofuzzy
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@yt2095 does that mean that Copper(II) fluorescein is water soluble?
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indigofuzzy
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I've tried a few experiments with the fluorescent ink: added it to a CuSO4 solution, which turned emerald green with no ppt. crystallized into a green
mass with blue fluorescence. added it to a soln of MgSO4, which stayed about the same color. fluorescence is intensely green when in solution, and
pale blue when soaked into filter paper and dried.
added it to a soln of FeSO4, which resulted in a yellow-brown ppt, leaving the liquid phase very pale yellow. The liquid phase is still intensely
fluorescent, the ppt is not.
also tried adding the ink to a slurry of Ca(OH)2 in excess water. No visible change to the liquid phase, but the remaining solids have taken on a
yellow color. the liquid phase still has strong yellow-green fluorescence, but the solids now glow white (with a near-UV led) or pale yellowish (with
a blacklight tube)
Side-notes: the fluorescent ink is from a Sharpie(tm) accent hi-lighter. Fluorescence has been tested with a 380nm near-UV LED, as well as with an 18"
household "Blacklight" tube.
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YT2095
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| Quote: | Originally posted by indigofuzzy
@yt2095 does that mean that Copper(II) fluorescein is water soluble? |
all I can say with any certainty is that my fluorescein (as the free acid) is hardy water soluble at all, and the addition of copper carbonate allowed
more to dissolve.
And that the resulting soln was not any different in color to me than if I`d used NaOH, there was also plenty of undissolved material even after
heating.
\"In a world full of wonders mankind has managed to invent boredom\" - Death
Twinkies don\'t have a shelf life. They have a half-life! -Caine (a friend of mine)
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Zephyr
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NightHawkInLight recently posted an informative and repeatable video on youtube about how to extract fluoroscein from highlighters markers. After
following his procedure i had a total yield of 1.83 grams of fluoroscein. The best thing about his procedure is the fact that the only materials
needed are available OTC and the procedure is simple and easily reproduced.
My father is a ground water geologist and uses fluoroscein and many other tracers in his work. Another aesthetic dye he works with is Rhodamine-6G,
I'm not sure if this can be synthesized by the amateur but it can be purchased inexpensively on eBay.
Rhodamine:
http://en.wikipedia.org/wiki/Rhodamine
Extract Fluoroscein:
http://www.youtube.com/watch?v=zIpoLiesBgg
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