Re: gum on vellum
I understand that vellum or parchment are strictly speaking terms only used to describe paper made from animal hides. However paper made from wood pulp, or other such vegetable material, takes on similar properties (tough, dense and more transparent) when subjected to an industrial process featuring baths of concentrated sulphuric acid. That sort of paper is correctly called vegetable parchment, but often described simply as parchment or vellum paper. Don Sweet ----- Original Message ----- From: "Judy Seigel" <jseigel@panix.com> To: <alt-photo-process-l@usask.ca> Sent: Wednesday, May 21, 2008 10:58 AM Subject: Re: gum on vellum > > On Tue, 20 May 2008, sam wang wrote: > > > Chris, > > > > Get the brand name from the student before he escapes for the summer. > > > > One cheapy vellum can be very different from another. Most can stand one coat > > gum with no problem, but more than one coat is a different story. > > My experience is that at any price there's no rhyme or reason to what's > labelled "vellum." As I recall, the original article was pounded out of > sheepskin (of which I once tried an extremely costly sheet, to no success) > but I've seen everything from translucent/thin to heavy/opaque called > "vellum," not to mention all those so-called "vellum" finishes. > > J.
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