h a l f b a k e r yAssume a hemispherical cow.
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The heat from coffee or tea poured into this mug activates a powerful led light which is split by a tiny prism encased in the rim to project a wispy rainbow onto the escaping steam.
Rainbow in steam over coffee
https://www.reddit...._my_morning_coffee/
it's very faint in the photo, but I'm sure I've seen this effect. [Frankx, Jan 11 2022]
[link]
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Hmm... you might run into issues using an LED (not enough of
a "spread spectrum"). Use a good old-fashioned incandescent
bulb. |
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Sinse the steam is visible beacuse it is made of tiny water droplets, wouldn't it bow anyway? There's probably some obvious technical reason why not that I am to thick to think of this morning. |
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Pastry deposited in haste, before someone thinks of a
reason why this can't work. [+] |
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+ This would be pretty for drinking some rainbow
tea! |
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I like this. May I suggest that the source pot of coffee or tea
be painted to be a 'Pot of Gold'? |
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// Nope. Explaining why not requires a short science class (linked).// |
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According to Quora the number one answer to the question;
"Will white LED disperse into seven colours of rainbow when passed through a prism?" |
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"Yes, of course it will. However (1) the intensity of the colors will not be as uniform as that with sunlight; (2) The color distribution seen may vary with manufacturer." |
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Now about deleting my annos from your postings... you got a stick up your ass? |
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To create a real rainbow in your hot drink vapour you need (1) a bright light source offset slightly from your head, such that the line from your eyes to the mug to the light source is an angle of 42°, (2) cool air so that the vapour condenses and forms suspended droplets, and (3) dark background. |
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Suggested is to wear a voluminous matt black cape, and carry a walking stick, and wear hat-mounted lamp arm about 1m long which supports an incandescent light bulb with a parabolic reflector and shades to direct the light onto the cup which can be held at arms length in front of the cloak ( supported on the telescopic rail and tripod feet of the converted walking stick), which provides a dark background or viewing the resultant bow. |
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Alternatively build the kitchen or serving area such that the point where the drink consumer stands or sit is illuminated by a bright light from behind them and to one side (to create the 42° angle), while the area in front of them is dark and un-illuminated to give the required dark background. Climate control outlets can ensure that the counter-top is filled with cool, saturated and fairly still air to maximise vapour formation. |
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//wear a voluminous matt black cape, and carry a walking
stick, and wear hat-mounted lamp arm about 1m long which
supports an incandescent light bulb// |
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Working out any possible kinks with this idea would
be well worth it. What a great positive visual to
start your day. |
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// Working out any possible kinks with this idea would be well worth it. // |
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Some people's kinks is a stick up the ass. Luckily, [poc] has a walking stick, a stage, and a cape. |
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Thinking a fan in the handle blowing the steam in a
vortex using aimed holes outside the rim might give
you a little steam tornado column that would catch
the light more effectively. |
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//you might run into issues using an LED (not enough of a
"spread spectrum")// |
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This is a problem in the process of stopping being a problem,
on account of a solution. The old white LEDs would be a
mixture of chemistries, or of separate emitters clustered
together in one housing. Since the development of blue and
now UV LEDs we can just use various phosphors to tune the
emission spectrum however you like. |
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I did some very half-baked experimenting this evening. Preliminary conclusions: very bright but small and shielded light source required. Very dark room required. Cold ambient temperature required. No rainbow spotted before a disembodied voice came from the other room: "is my tea ready yet? Why is the light off in the kitchen? Are you ok?" |
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//just use various phosphors to tune the emission
spectrum// |
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Interesting; what do you mean by "various phosphors"? |
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Actually, don't worry; I looked it up. |
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My only question is, is there generally *enough* steam for
this to work? [+] |
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I saw a rainbow projected on the steam of a mug one day on an imgur gif. Can't find it anymore, it was pretty cool and probably removed so some asshole like me wouldn't start a clock ticking. Oops. Tried for far longer than I should have to find it again for a link but no luck. It made me think that it should be able to recreated artificially. |
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~Directed by M. Night Shayamalan~ |
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sp. Dark Night Shimmer-Dram |
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After noting that in weather forecasts "freezing fog" is a thing,
I believe a warming rainbow, i.e., steambow is sure to be a
hit. We have steam, why not use it to the utmost? |
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