On 4 Jan 99,, the dancing digits of Wade Lawrence delivered: > What is the current thinking in the conservation community about the use > of PVC piping for storing rolled architectural drawings? The last I heard vinyl (PVC) in any form should be avoided. > Does PVC offgass anything that > will harm any of these media? Vinyl off gasses chlorine. If I remember right from my chemistry classes, chlorine will combine with the oxygen in whatever it contacts. It will usually pull the oxygen out of any other molecules. Wayne Haegele