Ref: Note from John Phillips.

As a one time chemist, I am always curious about the identification of
materials of all kinds.  My cross-reference chemical list does not have
an entry for "white spirit".  Can you enlighten me more, John?

Based on your comments I would guess that it is a hydrocarbon based
solvent probably similar to what we might call naphtha in the U.S.
Another possibility could be "mineral spirits" or paint thinner.  The
general term "spirit" is used for many volatile solvents ranging from
alcohols to hydrocarbons.  In this case, I would guess that an alcohol
might not soften the tape residue as easily as a hydrocarbon but I could
be wrong.

A product that I have found useful for removing dried masking tape
residue from wood is "Gumout (tm) Carburetor Cleaner".  This comes in a
spray can and works very well for this nasty job.  I have not tried it on
paper but it might be worth a shot.

You are wise to stay away from benzene.  It is a highly toxic solvent.
Toluene has similar solvent activity, is not as toxic but is also good to
avoid if possible.  Toluene is not quite as volatile as benzene but still
can be a problem.

Chuck Walker (cewalker@prodigy.com)¶
Hopewell Junction, NY