Why are sand dollars white when they wash up on the beach?

The white sand dollars you find are actually their skeletons, called tests. After the spines fall off, the sand dollars are eroded until just the test remains. Then the sun bleaches the tests, eventually turning them white, according to Mother Nature Network.



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In most states, taking a living sand dollar from the beach is illegal. However, laws vary about collecting a dead sand dollar. It's best to check for signs at the beach, look at your state laws online or ask a lifeguard or warden working at the beach.

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Sand dollars can't survive out of the water, so if you find a live one, put it gently back in the water. If you find a sand dollar on the beach, it is probably no longer alive and it is ok to take. Even sand dollars that look grey or tan in color are dead if they have no tiny coating of furry spines on them.

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