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Morgan
International Hazard
Posts: 1666
Registered: 28-12-2010
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Mood: No Mood
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I happened to see a cluster of petunias growing by the sidewalk and picked one for an experiment. The color changing effect of touching it with a
cigarette wasn't all that I hoped for. Other flowers are more dramatic but at least this one changed, from purple to a deep blue. I tried to blow the
ashes off but they stuck to the surface and it was starting to wilt. Once picked, these are not long-lived flowers.
For an artistic slant, it might be interesting to try a wicking capillary action to change the color of some flowers with pH or to decorate the petals
with some affecting solution or maybe with some carefully applied vapor or heat - hopefully something more unique than hydrangeas and what's already
been done. There's probably a lot of strange things you could come up with.
Tidbits
Synchrony between flower opening and petal-color change from red to blue in morning glory, Ipomoea tricolor cv. Heavenly Blue
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3559195/figure/f...
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3559195/
Heaveny blue possible use as a food colorant, very stable in the pH range of 2-8.
https://books.google.com/books?id=1mSCl4Hd5dwC&pg=PA261&...
  
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Fantasma4500
International Hazard
Posts: 1677
Registered: 12-12-2012
Location: Dysrope (aka europe)
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Mood: dangerously practical
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anthocyanins are in many plants, i recall even in leaves, resulting in their colour change
red cabbage is 28.7mg/100g, blueberries is 48mg/100g and elderberries as much as 1217mg/100g
elderberries can be picked in large amounts if you have the plants growing near you, potentially as much as 121.7g anthocyanins could THEORETICALLY be
extracted from 10kg elderberries.. i dont know if the 100 grammes is dried out, and/or without seeds, but its still a whole lot more than red cabbage
a proposed solvent for extracting anthocyanins would be 70% EtOH(30% H2O i guess?) with 1% citric acid, i could have gotten some of the numbers wrong
but if youre looking for random show chemistry, anthocyanins is one of the better, i have several times picked random uneatable berries hanging around
on bushes and what not, crushed them up and boiled the water to get the anthocyanins into solution, to then play abit around with its colour
absorbance properties
elderberries grows mainly after summer, if anybody was really thinking about doing this others than me, i recall also seeing on alibaba that the
extracts are around 75% pure anthocyanins, so i guess its quite a struggle to purify.. extracting it with basic pH is best avoided, anthocyanins arent
very stable in basic pH, dont know if were talking hours or months or years, it does however at acidic pH store quite well, red wine is my reference
for this
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