Pincushion Spine Colors?

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michaelzoellner

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Recently purchased two pincushion urchins from my lfs. Noticed one has pure white spines, while the other has black tips on its white spines. Is this normal, or do the black tips mean anything?
IMG_3892.jpeg
IMG_3891.jpeg
 
Ecoscape Reef Rock
I believe these can be normal color variations for these urchins.
 

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