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does gen crystal reflect rainbow under the light?


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15 replies to this topic

#1
Erict719

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As title

#2
sneed12

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you come up with the weirdest questions



#3
1680

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you come up with the weirdest questions

 

:crazy:

 

 

@Erict: I never noticed this...



#4
gran

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No not under the light

 

highway-rainbow-590x442.jpg



#5
Erict719

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Lol because I thought their crystal is very pure.
Mine always have rainbow showing around the edge

#6
Nanuq

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Different types of "plastic" have different indexes of refraction.  The higher the index (and arguably the higher the quality) the more the refraction. 

 

So a high quality/index "plastic" will show more "rainbows" due to refraction than a lower quality/index "plastic."



#7
freddy333

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As Nanuq said
6542rainbows0081.jpg

If you have a gen & aftermarket xtal of the same type under the same light, the gen should sparkle more. But basing authentication on light refraction is not a reliable path to follow.

#8
Erict719

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so the crystal is plastic???

#9
1680

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You often ask about sapphire watches, so assumed you ask for a sapphire crystal?

If you meant a plexi then yes they show rainbows like Nanuq and freddy said.



#10
Erict719

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I am asking about sapphire . Like 16610 crystal.
Should they show rainbow??

#11
freddy333

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Only if it has an AR coating (the AR refracts the light). The cyclops on my TT GMTIIC has AR & it is the only part where the light refraction creates the rainbow effect
eyear20051.jpg

#12
Nanuq

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It gets even weirder than this.  It's at the light boundaries where refraction occurs.  So air/glass refracts, then again on the other side where the glass/air interface is.  If you had two layers of glass you'd have refraction as glass/air/glass/air (out the back side).  There are also minor internal refractions from the "inside" face of the glass/air boundary back into the glass.  You can get some crazy moire' patterns that way.

 

Try looking at your crystal under a polarizing filter.  It's better than Andy Warhol and root beer.



#13
Erict719

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Mine is not ar. And yes the rainbow happen inside the crystal and only at the where the crystal and the inner engraving part is

#14
gran

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rehaut?



#15
Erict719

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Yes

#16
preacher62

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Any glass can break up the light, especially if it has angles at the 45, and the light hits it just right.  You don't need to get a gen crystal for that. 

 

I don't think that even Rolex governs rainbows...LOL.




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