I bought some whitish 1/16th inch gravel at my local landscaping store a few days ago. I heard that to test for limestone you should submerge the gravel in white vinegar and if you see bubbling there's limestone in it. Well I did the test and there's lots of bubbling, even from the dark colored rocks. 
So should I assume there's limestone in my gravel?
video.
http://www.youtube.com/watch?v=myAiMI9VpS0
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So should I assume there's limestone in my gravel?
video.
http://www.youtube.com/watch?v=myAiMI9VpS0
[YT]<object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/myAiMI9VpS0?fs=1&hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/myAiMI9VpS0?fs=1&hl=en_US" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object>[/YT]
