picklewi
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indelible marking of citrus peel
given the waxy surface and oil content of orange and other citrus peel it is very hard to mark these fruit indelibly.
I was beginning to lean toward tattooing them. Initially thinking of ballpoint ink but believed that I would have a problem cleaning away surplus ink.
Then thinking to try with a gelatine/silver chloride solution but would look at any other suggestions
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Oscilllator
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wait why do you need to mark oranges indelibly?
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Endimion17
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Obviously because his oranges are tough and have an alternative lifestyle.
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Mailinmypocket
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Have you tried solvent based permanent markers such as sharpies?
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malcolmf
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Tattooing with India Ink? Water-based, any surplus should easily wash off the waxy outer peel. (Specifically, I'm thinking of the ink used in Rotring
pens--I assume someone still uses them so the ink would still be available...)
That's black only, though. If all else fails, ask a friendly tattooist where to get actual tattooing ink, which would give you a choice of colours
and should be non-toxic.
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Mailinmypocket
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Actually... Why ARE you wanting to write in citrus fruit? Are you selling them and want to indicate the price? Is it an experiment where you need to
identify the citrus specimens? What about just sticking labels on them or pinning tags to them?
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Siggebo
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Wash them with something nice, like acetone, and then apply a solvent based permanent marker?
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paulr1234
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When I was a nipper in the UK, I seemed to remember oranges that were somehow marked with purple ink, a small stamp presumably done by the supplier or
supermarket for some reason.
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Morgan
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"Indelible ink sunkist" search results
http://books.google.com/books?id=natMAAAAYAAJ&pg=PA885&a...
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picklewi
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thanks for the suggestions so far -- for your edification I am asking because I wish to write / decorate the orange and then peel it to note the
disruption in the text/decoration. The release of oils in the torn skin tend to smudge the inks I have tried.
Since you ask, I wanted to be a chemist when young (and hence I love this site), I was later a mathematician and now I'm some kind of artist.
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SM2
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There is one thing which seems to Remove almost everything. Even baked on inks, but'tis unfortunately not for sale anymore.
The Product was called "Remove", and under the main title it said either acetone free, or free acetons.
was sold by Gina, and sold in beauty product stores for over 1 year.
Not having that, I'd imagine nitromethane would be a great solvent.
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zed
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Treat them like cows. With a hot,hot,hot...branding iron. Or, do you have a laser?
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Morgan
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Quote: Originally posted by picklewi  | thanks for the suggestions so far -- for your edification I am asking because I wish to write / decorate the orange and then peel it to note the
disruption in the text/decoration. The release of oils in the torn skin tend to smudge the inks I have tried.
Since you ask, I wanted to be a chemist when young (and hence I love this site), I was later a mathematician and now I'm some kind of artist.
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I was toying with a grapefruit and seeing if it would hold a static charge and happened across this image on Google. It's nothing great but an
artistic statement of some sort using ink on citrus. I noticed he has a bit of a smudging effect too in the last shot, the ink not sticking. As an
aside, my "Leyden jar" grapefruit will arc over to my knuckle almost 5 cm. Maybe some metalic ink would help. ha
https://s3.amazonaws.com/imgspark.com/images/l/f0e8de664f78c...
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Morgan
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Here's something called Red 2 you might use on a lemon or grapefruit I don't know. Or if your orange wasn't orange enough to begin with. Probably a
blue or green would be more pleasing of course.
http://en.wikipedia.org/wiki/Citrus_Red_2
http://littlelocavores.blogspot.com/2011/02/when-orange-isnt...
http://www.omg-facts.com/view/Facts/43999
Reactivity Profile
CITRUS RED NO. 2 is an azo compound. Toxic gases are formed by mixing compounds containing azo groups with acids, aldehydes, amides, carbamates,
cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong
oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with
strong oxidizing agents, metal salts, peroxides, and sulfides.
http://cameochemicals.noaa.gov/chemical/20040
SUMMARY OF THE INVENTION
"The appearance of the printed image must not bleed, disappear, fade, or transfer to other fruit placed in contact therewith, under any of the
conditions and environmental changes thatfruit may encounter. For example, FD&C Blue #1 (CI Number 42090) is a major colorant in making violet or
blue citrus inks. However, its sensitivity to water makes a printed image formed therefrom on citrus "bleed" when condensation occurs without
theproper added ingredients. This is true to varying degrees with all FD&C dyes, due to their water solubility."
"Surprisingly, it has been discovered that ink jet ink compositions can be formulated to contain a non-water-soluble dye, such as Citrus Red #2 (C.I.
solvent Red 80), which when used at an appropriate concentration, can provide a readable,water-resistant message on oranges and other fruit, as well
as vegetables. Presently, Citrus Red #2 is used to color the skins of oranges that are not intended to be used for processing. The carrier medium for
the colorant comprises a lower alcohol,such as ethanol, optionally in combination with a denaturing agent, such as methanol, and acetone."
http://www.patentgenius.com/patent/5637139.html
[Edited on 19-1-2013 by Morgan]
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WolfPack
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What about a 9B pencil and some kind of lacquer or acrylic resin on spray? There are sprays for protecting paints with a thin, flexible and
transparent layer, for sanguine or chalk drawings.
Also, a laser is a great idea, as a laser mark can be very precise and not as coarse as a pencil, by using a lens. Most keychain lasers won't work but
they can be easily modified  .
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