Photocopy-resistant colored papers

There has been a thread recently on colored acid-free paper. I am
looking for the same type of archival paper, with a color (typically
reddish) that makes the text on it basically impossible to photocopy on
a regular office copier. Does anyone know of such a paper?

Luis Nadeau
Fredericton, NB, Canada

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                  Conservation DistList Instance 8:81
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