The correct way to make stain with penny's and steel wool. I have seen this several times but never with the correct ingredients...
Steel Wool and Vinegar, to age / weather new wood. - Wood Aging / Ebonizing / Weathering DIY (A Controlled Experiment)
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Variations of Stain - 2 vinegar washes to age wood [by SundayFundayBlog.com]
Age new wood to weathered gray driftwood look by disolving steel wool in vinegar then using as a stain/wash.
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Learn how to make Steel Wool and Vinegar stain to stain wood and give it an aged look. DIY Pete walks you through the steps in a video tutorial. Check it all out at http://diypete.com/steelwool