Tracing down paper - WetCanvas: Online Living for Artists

Can anyone explain to me what tracing down paper is &#; what its purpose is and where you would get such a thing?

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I was reading this book on WC pencils and the author said you first used some &#;tracing down paper, for later use&#; but never elaborated.

Is it something you folks all use?

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Grayeagle

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