Why does this sand turn my bearded dragons skin a different color?

i had calci sand (orange clored) for my bearded dragon, and it started to turn his skin orange. what color of sand wont color his skin?
Update: i had orange calci sand for my bearded dragon, the sand got caught up in his scales and just made him look orange, which i didnt like. will all sand do this or just the orange sand?
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