How do I brighten up river rocks?

by Chilelady

I have just put down a "dry river bed" in my backyard. The rocks are between 3-5 inches. I love the look of them when they are wet. it brings out all the beautiful earth tone colors. When dry, however, they are pretty dull and dusty looking. Is there anything I can do, a spray perhaps, that would bring out the colors? HELP!

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