** CACHE IS NOT LOCATED AT THE POSTED COORDINATES **
(but there is a rainbow there)
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It is not uncommon to see a rainbow behind or ahead of a rain storm, but have you ever seen a double rainbow?
According to AccuWeather.com meteorologists, a ray of sunlight passes through a raindrop, reflecting off the back of the drop at varying angles.
Along with this reflection is refraction of light that causes of a spectrum of colors-- red, orange, yellow, green, blue, indigo and violet.
Certain angles and "bending" reflect light better for refraction to occur, and the amount of light refraction corresponds to wavelength and color.
For example, blue light is always refracted at a deeper angle than red light. This is the reason blue is found at the inside of the bow and red on the very outside.
Nature's natural color spectrum always elicits the same pattern (red, orange, yellow, green, blue, indigo, violet) when light is refracted, commonly known from the Roy G. Biv mnemonic.
While a primary rainbow is visible when light is reflected once off the back of a raindrop, a secondary and usually dimmer rainbow is spotted when light is reflected twice in a more complicated pattern.
The colors of the second rainbow are inverted, with blue on the outside and red moved to the inside. The second bow appears dimmer or cloudier because much more light is released from two reflections, and both bows cover a larger portion of the sky.
It is rare and unlikely, but three or even four rainbows can be seen on occasion, but only if they are reflected off of the earthly objects.
The best time to see a rainbow is in the early morning or late afternoon, when the sun is lower in the sky. When the sun is in a lower position, a higher bow can be seen.
Many rain droplets of all different sizes, not just one, are responsible for this phenomena. Perhaps billions of water droplets and sunlight reflections make a rainbow visible to the human eye.
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Now your challenge is NOT to find a physical Double Rainbow, but to find a "Geocaching" Double Rainbow. That means you must find TWO geocaches whose title includes each color of the Rainbow.
For example, here are my Double Rainbow Challenge qualifiers:
Big Red - GCP7TK - Found 4-18-2008
Red Polo ACT - GC1FHNV - Found 8-27-2008
BIG Orange Travel Bug Convention Center - GCK8VZ - Found 6-24-2008
Little Orange Copy Cat - GC322QH - Found 9-22-2012
Yellow Bullhead - GC49J1V - Found 12-07-2013
Arctic Jingles #23 - Don't Eat the Yellow Snow - GC2KCJC - Found 3-05-2011
Green Dog Pathway - GC1D5KC - Found 6-12-2009
Go Green, Go White - GC1D5KC - Found 3-29-2008
S&L Blue Line - GC1CC3F - Found 6-04-2008
What does this blue question mark mean? - GC3NKK6 - Found 12-21-2012
Indigo - Color of Light - GC3QC6B - Found 3-29-2013
Rainbow Indigo-Violet Raindrop - GCJE0R - Found 8-15-2009
45 - Violet - GC2QW3B - Found 3-26-2011
15 - Violet Blue - GC2QV04 - Found 3-26-2001
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Once you complete the requirements of this challenge, you may log a find online. In your online log, please include proof of your finds as shown above.
Now for the fine print....
** You cannot use geocache titles where the color is PART of a word (i.e Bored walk, Evergreen, etc)
** You cannot use a geocache for more than ONE color, even if the title has two colors.
Difficulty / Terrain Rating is based on the challenge itself. Actual D/T rating is 1/1 for the hide.
Discovered there is a Project-GC checker for this challenge now. For those who want to shortcut their trip down memory lane... https://project-gc.com/Challenges/GC5BCJA/10268