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I would not recommend putting anything on your site that Google can see but not your customers. From- https://support.google.com/webmasters/answer/66353?hl=en Hiding text or links in your content to manipulate Google’s search rankings can be seen as deceptive and is a violation of Google’s Webmaster Guidelines. Text (such as excessive keywords) can be hidden in several ways, including: Using white text on a white background Locating text behind an image Using CSS to position text off-screen Setting the font size to 0 Hiding a link by only linking one small character—for example, a hyphen in the middle of a paragraph

Hi Dan, Hopefully your read-through of Google's guidelines will have helped to clear this up, too.