Sheldon wrote:

> > "Cooking parchment (also parchment paper, kitchen parchment,
> > greaseproof paper and cooking paper) refers to a form of
> > silicone-impregnated paper used as a substitute for parchment in
> > cooking. The silicone renders it grease- and moisture-resistant as
> > well as relatively heat-resistant. A common use is to eliminate the
> > need to grease cookie sheets and the like allowing very rapid
> > turn-around of batches of cookies in a commercial bakery. It can also
> > be folded to make moisture-proof packages in which food items are
> > cooked or steamed." (also known as en papillote)
> >
> > http://en.wikipedia.org/wiki/Parchment
>
> I'm not so sure that is always true about it containing silicone, mine
> doesn't. And I can assure you that large commercial bakeries do not
> use silicone paper for anything.

If it doesn't have silicone is is not parchment paper. By definition,
parchment paper is treated with silicone. Large bakeries do use them. FWIW
but googling "bakery supplies parchment paper" the first hit was a
commercial supplier that sells parchment paper pre-cut to baking pan sizes
in boxes of 1,000 sheets, hardly the quantity for home use, since most
rolls sold for household use are only 30-40 feet long.