Mylar or Polypropylene bags for sketches

What is recommended for bagging genga/douga and other such pieces of pencil-drawn artwork?

My genga and douga are all currently in polypropylene, and I am considering switching over to mylar. However, I read an online article that mentioned that pencil lines could stick to mylar bags and be lifted off of the paper, so only polypropylene bags should be used.

Does anyone here have any suggestions or recommendations of their own? (I've seen various discussions about mylar vs. polypropylene for bagging cels, but I haven't found really anything about which is preferred for pencil sketches....)

Also, are buffered backing boards a good thing to use when bagging sketches in order to neutralize any possible acidity from the paper?

Thanks!

I don't think it makes much of a difference which you use for neither will damage your sketch.

I have never heard of pencil lines of a sketch being drawn onto paper being lifted onto a bag. It sounds more like they may have ment the lines on a cel that are on front layer of a cel ala "line fading".

I would suggest using acid free paper , boards and such. Buffered backing boards are a good idea.

Hi!

I reread the article about mylar bags (and found a few others online that mentioned similar problems), and it's not so much a problem with line fading, but a problem with static from the mylar attracting pencil particles to the bag.

For this reason, the articles don't suggest that artwork done with friable materials such as pencil, charcoal, or pastels be placed in mylar bags....

Thoughts?