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I go from water to stone,

I am the shades of a rainbow,

I help the blind see,

I help the thirsty drink,

What am I?

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  • $\begingroup$ Welcome to Puzzling.SE! Very clever riddle +1 $\endgroup$ – North Feb 22 '18 at 14:59
  • $\begingroup$ Thanks! Although I regret accepting the answer so quickly. I know other stackexchange sites prefer to wait a day, but I was so excited to see someone get the answer right. Is it alright that I accepted the answer so quickly? $\endgroup$ – Erdrik Ironrose Feb 22 '18 at 15:38
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    $\begingroup$ Yes, absolutely fine. The only reasons I know of to delay acceptance are: (1) for some reason you think an even better answer might come along, (2) you want more people to view the question (fewer will look if it's been solved, (3) accepting answers is a chore, so you leave them for a while and do them in batches. Those are all fine, but all else being equal it's good to accept promptly. $\endgroup$ – Gareth McCaughan Feb 22 '18 at 15:44
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    $\begingroup$ I found this question on meta for you. $\endgroup$ – Jack Pettinger Feb 22 '18 at 15:46
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Is it

Glass?

I go from water to stone

Water on stone makes sand, which is used to make glass.
Glass starts out as a liquid and is cooled into a solid. (Credit Mart10)

I am the shades of a rainbow

A glass prism can be used to make a rainbow effect.

I help the blind see

You can wear glasses.

I help the thirsty drink

You can drink from a glass.

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  • $\begingroup$ Aw beat me to it $\endgroup$ – Mart10 Feb 22 '18 at 15:18
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    $\begingroup$ For water to stone, i was going to say liquid state to solid state $\endgroup$ – Mart10 Feb 22 '18 at 15:19
  • $\begingroup$ Yeah, I too think @Mart10 's idea of molten glass being cooled into hard glass is probably more relevant. And your answer feels the most appropriate! $\endgroup$ – Phylyp Feb 22 '18 at 15:24
  • $\begingroup$ This is definitely what I was thinking of! :) Although after clicking accept, I realise maybe I should have waited. Puzzling seems a bit different to the other forums, not sure if I should have accepted ASAP or wait until tomorrow. $\endgroup$ – Erdrik Ironrose Feb 22 '18 at 15:37
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    $\begingroup$ @ErdrikIronrose - if you find that your puzzle is bringing in innovative answers (like Shinji Wins' answer), then you can choose to keep it open longer. Also, bear in mind that people across the globe use PSE, so in deference to timezones you might wish to keep it open for several hours to a day even if its solved. Note that this is not a rule or a stringent guideline, its more of my opinion. $\endgroup$ – Phylyp Feb 22 '18 at 15:48
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Is it a

wave?

Because

waves crash against stones
sounds in pedestrian crossing signal help blind people cross the street and so "see" traffic (sound is a wave)
rainbows are made up of several WAVElengths
waves help you drink water since it goes directly in your face

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  • $\begingroup$ I like the thought process you have here, but I was thinking of something a bit less abstract. $\endgroup$ – Erdrik Ironrose Feb 22 '18 at 15:39
  • $\begingroup$ my last explaination is a bit far-fetched though ^^ good riddle ;) $\endgroup$ – Flying_whale Feb 22 '18 at 15:42
  • $\begingroup$ +1 for last line :D $\endgroup$ – NL628 Apr 28 '18 at 0:50
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Are you

Water itself?

I go from water to stone

Water turns into ice, a solid state. (credit to puzzledPig)

I am the shades of a rainbow

Rainbows are light diffracting off water moisture in the air.

I help the blind see

Eyelids spread water over the eyes to protect them, and without it you can end up with dry eye, leaving them vulnerable to infection.

I help the thirsty drink

Pretty self explanatory. You drink water.

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    $\begingroup$ The first clue could maybe also refer to the frozen form? $\endgroup$ – puzzledPig Feb 22 '18 at 15:11
  • $\begingroup$ I think you might be right there actually. $\endgroup$ – Shinji Wins Feb 22 '18 at 15:20
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    $\begingroup$ The "help the blind to see" feels like a stretch to me, but good thinking! Not what I had in mind though. $\endgroup$ – Erdrik Ironrose Feb 22 '18 at 15:40
  • $\begingroup$ @ErdrikIronrose Frankly I find the “help the blind to see” a stretch in your accepted answer too. :-) It's more “help the mildly visually impaired (who can already see) to see better”. $\endgroup$ – ShreevatsaR Feb 23 '18 at 0:29

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